JP2006081445A - Mower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mower improving workability (operability) in mowing work. <P>SOLUTION: The mower is provided with a handle part 2 having a prescribed length in an axial direction, a mowing blade part 3 having a prescribed length and disposed on one side in the axial direction and a drive part 4 for driving the mowing blade part 3, and structured as follows: the handle part 2 and the mowing blade part 3 are equipped to be relatively turnable via a supporting axis part 33; a turnable operation part comprising a small-diameter rotary body 54, an operation dial 62 and a transmission belt 80 are equipped at the other side in the axial direction with respect to the mowing blade part 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a brush cutting device (also referred to as a pole hedge, a pole cutter, or the like) for cutting branches and leaves in high places.

  In general, the brush cutter has a cutting unit disposed at the tip of a handle having a predetermined length, and has a drive unit for driving the cutting unit. And a cutting blade part is driven to reciprocate by driving a drive part, a user grasps a handle | pattern part, and cuts a branch and leaf so that a cutting blade part may be located in the height of a branch and leaf. As such a brush cutting device, a handle portion and a cutting blade portion are provided rotatably via a support shaft, and an angle adjusting portion is provided for adjusting an inclination angle of the cutting blade portion with respect to the handle portion. There is a technology (for example, see Patent Document 1).

The angle adjustment unit in this brush cutter has an operation dial for angle adjustment that is operated by the user to adjust the inclination angle of the cutting blade part with respect to the handle part, and this operation dial is located at a position corresponding to the support shaft. Provided. Then, by rotating (turning) the operation dial in the loosening direction, the cutting blade portion can be rotated with respect to the handle portion, and by rotating the operation dial in the direction of tightening, the cutting blade portion with respect to the handle portion. Can no longer rotate. Therefore, the user rotates the operation dial in the loosening direction to change the angle of inclination of the cutting blade relative to the handle, and then rotates the operation dial in such a direction that the cutting blade does not rotate relative to the handle. By doing so, the inclination angle with respect to the handle is determined.
JP 2002-58341 A

  In the above conventional brush cutter, the handle has a predetermined length, and therefore, when performing the brush cutting work with the front side of the handle, the angle adjustment operation dial is far from the user. Will be in position. For this reason, when trying to change the inclination angle of the cutting blade part, the inclination angle of the cutting blade part can be adjusted by changing the position of the handle part so that the operation dial is positioned closer to the user, or In some cases, the cutting angle is adjusted by interrupting the mowing operation and operating the operation dial. Thus, in the conventional brush cutter, workability at the time of changing the inclination angle of the cutting blade portion with respect to the handle portion was poor.

  Then, this invention makes it a subject to provide the brush cutter which can improve workability | operativity at the time of changing the inclination-angle of the cutting blade part with respect to a handle | pattern part.

  The brush cutting device 1 of the present invention includes a handle 2 having a predetermined length in the axial direction, a cutting blade portion 3 disposed on one side in the axial direction of the handle 2 and having a predetermined length, and the cutting A driving portion 4 for driving the blade portion 3, the handle portion 2 and the cutting blade portion 3 are provided so as to be relatively rotatable around the support shaft portion 33 via the support shaft portion 33, The rotation operation part 41 for rotating the handle part 2 and the cutting blade part 3 relative to the support shaft part 33 is the other side in the axial direction of the handle part 2 with respect to the cutting blade part 3 of the support shaft part 33. The cutting blade portion 3 and the rotation operation portion 41 are connected to each other via a transmission portion 79 so as to be rotatable.

  In the above configuration, the operator grasps an appropriate portion of the handle 2 so that the cutting blade 3 is applied to the branches and leaves, and drives the driving unit 4 to drive the cutting blade 3 to cut off the branches and leaves. By the way, when operating the rotation operation unit 41 in order to change the inclination angle of the cutting blade unit 3 with respect to the handle 2 depending on the location of branches and leaves, the rotation operation unit 41 has a cutting blade unit with respect to the support shaft unit 33. 2 is located on the other side in the axial direction of the handle 2 on the opposite side. That is, since it is on the side closer to the user, the user can operate the rotation operation unit 41 without greatly changing the posture during the brush cutting operation, and by operating the rotation operation unit 41. Since the cutting blade portion 3 can be rotated around the support shaft portion 33 by the transmission portion 79, the inclination angle of the cutting blade portion 3 with respect to the handle portion 2 can be easily changed.

  In the brush cutting device 1 of the present invention, the handle portion 2 and the cutting blade portion 3 are connected via a head 5 having a drive unit 4 incorporated therein, and the width B1 in the direction perpendicular to the axial direction of the head 5 is The rotation operation unit 41 is formed so as to be larger than the width B2 of the part 2, and the rotation operation part 41 protrudes from the side surface of the handle part 2 and operates the rotation body 54. The rotation operation member 62 is set so as not to protrude from the maximum protrusion 31 a in the width direction of the head 5.

  As described above, the rotation operation member 62 is set so as not to protrude from the maximum protrusion 31 a in the width direction of the head 5 in the handle portion 2, so the rotation operation member 62 is provided on the handle portion 2. Even in this case, the rotation operation member 62 hardly interferes during the brush cutting operation, and it is possible to suppress a decrease in workability during the brush cutting operation.

  In the brush cutting device 1 of the present invention, the cutting blade portion 3 is provided so as to be rotatable integrally with the support shaft portion 33, and a rotating body 54 that is rotated in accordance with the rotation operation of the rotation operation portion 41 is provided. The diameter of the rotating body 54 is set smaller than the diameter of the support shaft portion 33. Thus, by setting the diameter of the rotating body 54 to be smaller than the diameter of the support shaft portion 33, the support shaft portion 33 can be reliably rotated even if the rotation operation force on the rotation operation portion 41 is small. The inclination angle of the cutting blade part 3 with respect to the handle part 2 can be adjusted.

  In the brush cutter 1 of the present invention, the transmission unit 79 includes a small-diameter pulley 56 that is externally fitted to the rotating body 54, a large-diameter pulley 48 that is externally fitted to the support shaft 33 and has a larger diameter than the small-diameter pulley 56, The transmission belt 80 is configured to connect and transmit the small diameter pulley 56 and the large diameter pulley 48 to rotate.

  According to the above configuration, when the rotating body 54 is rotated, the small-diameter pulley 56 is rotated, and the large-diameter pulley 48 is coupled and transmitted via the transmission belt 80 to rotate, so that the cutting blade 2 is rotated with respect to the handle 2. The inclination angle of the part 3 can be changed. In particular, by using the transmission belt 80 for the transmission portion 79, the configuration of the transmission portion 79 can be simplified, and the rotation operation of the rotating body 54 can be reliably transmitted to the support shaft portion 33 even with a simple configuration. In addition, by setting the ratio to the diameters of the pulleys 48 and 56, the support shaft portion 33 can be reliably rotated even with a small rotational operation force with respect to the rotational operation member 62. It becomes possible.

  In the brush cutter 1 of the present invention, the concave and convex portions 52 and 51 are provided at predetermined intervals in the circumferential direction on the outer peripheral surface of the support shaft portion 33, and the concave and convex portions 55 b and 55 a are provided at predetermined intervals in the circumferential direction on the outer peripheral surface of the rotating body 54. A first engagement portion that is movable between the support shaft portion 33 and the rotating body 54 in the axial direction of the handle portion 2 and engages with the concave and convex portions 52 and 51 of the support shaft portion 33. 100 and a second engagement portion 107 that engages with the concave and convex portions 55b and 55a of the rotating body 54 are provided, and a movement operation member 81 is provided for moving the movement member 95 in the axial direction. The second engaging portion 107 is engaged with the concavo-convex portions 55b and 55a of the rotating body 54 in order to restrict the relative rotational movement of the handle portion 2 and the cutting blade portion 3 with a predetermined restricting force. From this state, the movement operation member 81 is operated so that the first engaging portion 100 is uneven on the support shaft portion 33. The first engaging portion 100 is engaged with the concavo-convex portions 52 and 51 of the support shaft portion 33 when the handle portion 2 and the cutting blade portion 3 are prevented from rotating relative to each other. It is characterized in that the circumferential separation angle E2 of the concave and convex portions 52 and 51 of the support shaft 33 and the circumferential separation angle E1 of the concave and convex portions 55b and 55a of the rotating body 54 are related to each other.

  In the above configuration, when the moving operation member 81 is operated to move the moving member 95 toward one side in the axial direction of the handle portion 2, the first engaging portion 100 of the moving member 95 becomes the uneven portion 52 of the support shaft portion 33. , 51 is engaged, and the cutting blade 3 is in a locked state in which the cutting blade 3 is held in a non-rotating state with respect to the handle 2. Further, when the moving operation member 81 is operated to move the moving member 95 toward the other side in the axial direction of the handle portion 2, the first engaging portion 100 is detached from the concave and convex portions 52 and 51 of the support shaft portion 33. While the locked state is released, the second engaging portion 107 engages with the concave and convex portions 55b and 55a of the rotating body 54 with a predetermined regulating force. Then, the support shaft portion 33 and the rotating body 54 are coupled and transmitted by the transmission portion 79, thereby restricting the rotating operation of the rotating body 54. Therefore, against the handle portion 2, the weight rotates by the weight of the cutting blade portion 3, or the weight of the driving portion 4 and the cutting blade portion 3, which is contrary to the intention of the user and rotates around the support shaft portion 33. Therefore, the safety when changing the inclination angle of the cutting blade portion 3 with respect to the handle portion 2 can be ensured.

  Here, the moving operation member 81 is operated from the state in which the second engaging portion 107 is engaged with the concavo-convex portions 55 b and 55 a of the rotating body 54 to move the moving member 95 toward one side in the axial direction of the handle portion 2. When the first engaging portion 100 is engaged with the uneven portions 52, 51 of the support shaft portion 33, the circumferential separation angle E2 of the uneven portions 52, 51 of the support shaft portion 33 and the uneven portions 55b of the rotating body 54, Since the circumferential separation angle E1 of 55a is related, when the movement operation member 81 is operated to move the movement member 95 toward the one side in the axial direction, the first engagement portion 100 becomes the support shaft portion. It engages with the concavo-convex parts 52 and 51 of 33, and it will be in a locked state reliably. Accordingly, the user can surely know that the cutting blade portion 3 is in a locked state in which the cutting blade portion 3 is not rotated with respect to the handle portion 2, and thus can use the brush cutter 1 with peace of mind.

  Here, the predetermined regulating force is the cutting blade part 3 or the cutting blade part 3 and the driving part 4 when the moving member 95 moves to the other side in the axial direction to release the locked state of the cutting blade part 3. Even if the weight acts as a moment around the support shaft part 33, the cutting blade part 2, or the cutting blade part 2 and the drive part 4 cannot be rotated with respect to the handle part 2 by such force. is there.

  According to the present invention, since the operation unit for changing the inclination angle of the cutting blade portion with respect to the handle portion is arranged on the user side, the operation for changing the inclination angle of the cutting blade portion with respect to the handle portion is performed. It is possible to provide a brush cutter that can improve the performance.

Hereinafter, a brush cutter (also referred to as a pole cutter, a pole hedge, or a hedge trimmer) according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an overall front view of a brush cutter device with a part of the handle portion omitted, FIG. 2 is an overall plan view of the brush cutter device with a handle member omitted, and FIG. 4 is a partially enlarged front sectional view showing a rotating state, FIG. 4 is a partially omitted plan sectional view showing a main part of the internal structure of the brush cutter, and FIG. 5 is a partially enlarged front sectional view showing a main part of the internal structure. 6 is a front cross-sectional view in which the main part is further enlarged and the operation lever is in a locked posture, FIG. 7 is an enlarged front cross-sectional view in which the operation lever is in a release posture, and FIG. 8 is an enlarged front cross-sectional view drawn around the operation lever. FIG.
It is.

  As shown in FIG. 1 to FIG. 6, the brush cutter 1 is used particularly effectively for cutting off the branches and leaves at a high place, and is a portion gripped by the user for the operation of the brush cutter 1. A cylindrical handle portion (pole) 2 having a predetermined length in the axial direction, a cutting blade portion (cutter) 3 disposed on one side (tip side) in the axial direction of the handle portion 2, and the cutting blade And a drive unit 4 for driving the unit 3. By adding the length of the cutting blade part 3 to the length of the handle part 2, it is possible to cut off the branches and leaves at high places.

  As shown in FIG. 7, the cutting blade portion 3 is attached to one side in the axial direction of the handle portion 2 via a head 5 in which a drive portion 4 is housed. The drive unit 4 is built in the head 5 and unitized. The cutting blade portion 3 protrudes from the bottom of the head 5 toward the one side (front side) in the axial direction in a state where the blade fixing plate 6, the movable blades 7 and 8, and the blade presser 10 are overlapped. As shown in FIG. 2, in plan view, the width B2 of the handle 2 is formed smaller than the width B1 of the head 5, and each of the head 5 and the handle 2 is half in the axial direction and along the longitudinal direction. It consists of split-shaped handle main body parts 11 and 12, head main body parts 13 and 14, etc., and these handle main body parts 11 and 12 and head main body parts 13 and 14 are combined to form screws 15a and 15b as shown in FIG. By using and fixing, the head 5 and the handle part 2 are assembled. The handle portion 2 is adjustable in length in the axial direction (telescopic type), and has an adjusting portion 16 for adjusting the axial length of the handle portion 2. A narrow ridge 13a that fits into the other groove (not shown) is formed on one of the mating surfaces of the head main body portions 13 and 14 at an appropriate position, and the groove and the ridge 13a (for example, The mating surfaces of the head main body portions 13 and 14 are assembled so as to fit each other. Similarly, a narrow ridge 11a that fits into the other groove (not shown) is formed on one of the mating surfaces of the handle body portions 11 and 12 at an appropriate position, and the groove and the ridge 11a are connected to each other. The mating surfaces of the handle body portions 11 and 12 are assembled so as to be fitted.

  The handle part 2 has a first handle part 2A on one side in the axial direction and a second handle part 2B on the other side (near side) in the axial direction that are connected to each other via the adjusting part 16. The adjusting part 16 has a mechanism for adjusting the axial length of the entire handle part 2 by adjusting the amount of overlap between the handle parts 2A and 2B in the axial direction. As shown in FIGS. 5 and 6, the adjusting portion 16 includes a sliding member 17 that fits in the first handle portion 2 </ b> A and is movably fitted in the second handle portion 2 </ b> B. The adjusting portion 16 includes the sliding member 17, a pressing member 18 that can be pressed against and separated from the sliding member 17 from the upper surface, and a pressing member operation that is attached to the second handle portion 2B so as to be rotatable around the support shaft 20a. The operation lever 20 is provided. The pressing member 18 has a contact portion 18 a that has a predetermined contact area and can contact the sliding member 17. By rotating the operation lever 20 around the support shaft 20a in one direction (clockwise direction D2), the pressing force on the pressing member 18 is eliminated (released), and thereby the frictional force on the sliding member 17 is released. Thus, the first handle 2A and the second handle 2B can be separated in the axial direction, and the axial length of the handle 2 can be adjusted. Conversely, by rotating the operating lever 20 in the other direction (counterclockwise direction D1), the presser member 18 is pressed from above the sliding member 17 so that the shafts of the first handle portion 2A and the second handle portion 2B are in contact with each other. Make the approach and separation in the direction impossible.

  As shown in FIG. 7, the drive unit 4 is provided in the head 5, and includes a motor 21 for driving the cutting blade unit, a drive pinion 23 connected to the drive shaft 22 of the motor 21, and a gear meshing with the drive pinion 23. 24, a cam gear 25 that meshes with the gear 24, cams 27 and 28 that rotate around the cam shaft 26 as the cam gear 25 rotates, and two movable blades of the cutting blade portion 3 A drive mechanism 30 for reciprocally moving 7 and 8 is provided. Since this drive mechanism 30 is a well-known technique, its detailed description is omitted. As described above, the base end portion of the cutting blade portion 3 is connected to the drive mechanism 30 and protrudes forward from the bottom portion of the head 5 so as to have a predetermined length capable of cutting off the branches at high places. Have. As described above, the head 5 includes the motor 21 and the drive mechanism 30 and the like, and thus has a weight corresponding to those components.

  A part of the head 5 integrally has an extension portion 31 that extends toward the handle portion 2 and has a width larger than the width B2 of the handle portion 2. One side of the handle portion 2 in the axial direction is inserted into the extension portion 31. As shown in FIGS. 1 and 7, the power supply for driving the motor 21 is introduced from the outside, and the wiring 34 (lead wire) connected to the motor 21 is as shown in FIGS. The first handle portion 2A is inserted from the head 5 and led out from the other axial side of the second handle portion 2B. 1 and 2, reference numeral 35 denotes an operation piece for operating a main switch (not shown) for driving / stopping the motor 21, and this operation piece 35 is in the axial direction of the second handle 2B. The other side, i.e., the user's front side, is arranged at a position where it is easy to operate.

  As shown in FIG. 3, the brush cutter 1 according to the embodiment of the present invention sets a relative angle θ (θ1, θ2) that is an angle between the shaft centers of the handle portion 2 and the cutting blade portion 3 (head 5). A lock mechanism 36 for locking the cutting blade portion 3 with respect to the handle portion 2 is provided so as to be held at an arbitrary angle. Θ1 and θ2 are inclination angles of the handle 2 with respect to the axis 2a. Furthermore, it has the control part 40 which controls relative rotation operation of the handle | steering-wheel part 2 and the cutting blade part 3 with a predetermined control force, when the locked state in the lock mechanism 36 is cancelled | released. Furthermore, it has the rotation operation part (angle adjustment part) 41 which can adjust the relative angle of the pattern part 2 and the cutting blade part 3 against the control force of the control part 40. FIG. The lock mechanism 36, the restriction portion 40, and the rotation operation portion 41 are provided on the first handle portion 2A side.

  9 is a plan sectional view showing the structure of the entire main part, FIG. 10 is an enlarged view of one side, and FIG. 11 is an enlarged view of the other side. More specifically, FIG. 10A is an enlarged plan sectional view centering on the support shaft 33, FIG. 10B is a single enlarged front view of the lock plate 50, and FIG. 10C is an enlarged view of the large-diameter pulley 48. FIG. 11A is an enlarged plan cross-sectional view centered on the small-diameter rotating body 54, FIG. 11B is a single-unit front view of the regulated body, and FIG. .

  As shown in these drawings, a support shaft portion 33 that rotatably supports the handle portion 2 and the head 5 is provided at an overlapping portion of the handle portion 2 and the head 5. The support shaft portion 33 is annularly projected from the inner surface of the extension portion 31 of each head body portion 13, 14 toward the tip of the handle portion 2 (in FIG. 9, the direction is perpendicular to the axis 2 a of the handle portion 2). And a cylindrical portion 44 provided at the tip of the handle portion 2 and toward the extension portion 31 of each of the head main body portions 13 and 14 (in the direction orthogonal to the axis 2a of the handle portion 2 in FIG. 9). With. The annular protrusion 43 is formed integrally with each head main body 13, 14. The outer diameter of the annular protrusion 43 is formed to be smaller than the inner diameter of the cylindrical portion 44, and each head body portion 13, 14 is combined as described above, so that the respective portions in the width direction of the cylindrical portion 44 are combined. An annular projecting portion 43 is rotatably fitted in the cylindrical portion 44 from the opening 44a side. The support shaft portion 33 further includes a large-diameter cylindrical portion 49 that is rotatably fitted in the cylindrical portion 44 and a small-diameter cylindrical portion 59 at both ends in the width direction that are fitted and fitted into the annular projecting portions 43 of the head 5. A cylindrical shaft 45 is provided. A large-diameter pulley 48 that protrudes radially outward from the cylindrical portion 44 and has a spline-like large-diameter tooth portion 47 formed on the outer peripheral surface thereof is provided so as to be adjacent to the large-diameter pulley 48. A lock plate 50 having a larger diameter than that of the large-diameter pulley 48 is provided by being fitted and fixed to the portion 49. The large-diameter pulley 48 and the lock plate 50 are assembled to the support shaft portion 33 so as to rotate integrally. It rotates about the axis 48a by the same angle. The outer peripheral surface of the large-diameter cylindrical portion 49 and the inner peripheral surface of the cylindrical portion 44 constitute a sliding bearing.

  As shown in FIG. 10 (b), spline-like large-diameter tooth grooves 51 and 52 (corresponding to “uneven portions”) are formed on the outer peripheral surface of the lock plate 50 at predetermined intervals in the circumferential direction. As shown in FIG. 10 (c), trapezoidal tooth grooves 77 and 78 are formed at equal intervals in the circumferential direction on the outer peripheral portion of the large-diameter pulley 48. By the way, as shown in FIGS. 9 and 10 (a), the cylindrical shaft 45 is a two-part member composed of a cylindrical shaft portion 45a on the head main body portion 13 side and a cylindrical shaft portion 45b on the head main body portion 14 side. The region portion extended from the width direction to the head main body portion 14 side of the large-diameter pulley 48 is the cylindrical shaft portion 45b. The large-diameter pulley 48 is formed integrally with the cylindrical shaft portion 45b. The large-diameter pulley 48 and the lock plate 50 are respectively provided with fitting concave and convex portions 48c, 48d, 50c, and 50d having radial concave and convex shapes on the peripheral wall surfaces of the central holes. On the outer peripheral surface of the end portion on the head main body 14 side of the cylindrical shaft portion 45a, there are formed fitting irregularities (reference numerals omitted) that are relative to the fitting irregularities 48c, 48d, 50c, and 50d. When the lock plate 50 and the large-diameter pulley 48 are fitted into the mating uneven portion from the width direction, the cylindrical shaft portions 45b and 45b are configured to rotate integrally. 9 and 10A, reference numerals 69a and 69b denote the space between the side surface of the lock plate 50 and the intermediate end surface of the cylindrical portion 44, and the side surface of the large-diameter pulley 48 and the intermediate end surface of the cylindrical portion 44, respectively. Shown between the washers.

  As described above, the large-diameter pulley 48 and the large-diameter cylindrical portion 49 are fitted to rotate integrally, the cylindrical portion 44 and the large-diameter cylindrical portion 49 are rotatably fitted, and the small-diameter cylindrical portion 59 and Since the annular protrusion 43 is fitted to rotate integrally, the head 5 and the cutting blade portion 3 attached to the head 5 and the cutting blade portion 3 attached to the head 5 and the large diameter pulley 48 are rotated (rotated). It is configured to rotate around.

  As shown in FIG. 9, a small-diameter annular projecting portion 53 that projects in the width direction at a predetermined distance L1 on the other axial side of the handle portion 2 with respect to the support shaft portion 33 and in the middle of the first handle portion 2A in the axial direction. Are integrally formed. The small-diameter annular projecting portion 53 is arranged such that the axial center direction thereof is parallel to the axial center 48 a direction of the support shaft portion 33. A small-diameter rotating body 54 is rotatably fitted on the small-diameter annular projecting portion 53. The small-diameter rotating body 54 has a cylindrical restricted portion 55 that is slidably fitted to the small-diameter annular projecting portion 53 at one end thereof, and is formed closer to the handle main body 12 than the restricted portion 55. It has integrally the attaching part 57 which protrudes to the side from the trunk | drum middle part of the handle | body main-body part 12. As shown in FIG. A sliding bearing is constituted by the outer peripheral surface of the small-diameter annular protrusion 53 and the inner peripheral surface of the restricted portion 55. A sliding bearing is constituted by the outer peripheral surface of the base end portion side of the mounting portion 57 and the peripheral wall surface of the support hole 58 formed on the side surface of the handle portion main body portion 12 of the first handle portion 2A. 2A is rotatably supported. The outer peripheral portion of the support hole 58 is formed in a deformed cross section having ribs 60 in order to obtain a predetermined strength. The diameter of the small diameter rotating body 54 is set smaller than the diameter of the support shaft portion 33. A small-diameter pulley 56 is integrally formed in the middle of the small-diameter rotating body 54 in the axial direction.

  Further, the small-diameter rotating body 54 is configured to prevent the small-diameter pulley 56 from coming out of the support hole 58 because the small-diameter pulley 56 can contact the inner end surface of the support hole 58 in the width direction. An operation dial 62 as a rotation operation member having a circular shape when viewed from the front and a predetermined width B3 when viewed from the top is attached to the mounting portion 57. Since this operation dial 62 is attached to the attachment portion 57, it projects from the front end of the first handle portion 2A (the center of the support shaft portion 33) by the predetermined distance L1, that is, from the side surface of the first handle portion 2A. Are arranged on the user side. The operation dial 62 is a cover that covers a cylindrical gripping operation portion 63 having a larger diameter than the small-diameter pulley 56, a boss portion 64 that projects from the center of the gripping operation portion 63, and an open side of the gripping operation portion 63. 65. The boss portion 64 is externally fitted to the attachment portion 57, and the operation dial 62 is screwed into the female screw formed on the wall surface around the center hole 73 of the boss portion 64 from the outside in the width direction. 57 is fixed. On the outer peripheral surface of the grip operation unit 63, a plurality of protrusions (reference numerals omitted) along the width direction are formed at equal circumferential positions. This protrusion makes it difficult to slip when the operation dial 62 is rotated, and it can be easily rotated.

  The bottom plate 67 on the handle main body 12 side of the grip operation unit 63 includes an annular bulging portion 68 bulging in the width direction, and the bulging portion 68 is formed so as to protrude in the width direction on the side surface of the pattern main body portion 12. The recess 71 is formed by the annular outer cover member 70 formed. The relationship between the width B3 of the operation dial 62, the width B2 of the handle 2 and the width B1 of the head 5 is such that when the operation dial 62 is attached to the attachment portion 57 by the screw member 74, the operation dial 62 has a width of the head 5. It is set so that it does not protrude from the axial projection position with respect to the position of the maximum direction protruding portion (for example, the protruding portion of the maximum width portion of the extension portion 31) 31a.

  As shown in FIG. 11 (b), tooth grooves 55 a and 55 b (corresponding to “concave and convex portions”) are formed on the outer peripheral surface of the restricted portion 55 at equal intervals in the circumferential direction. As shown in FIG. 11C, small-diameter tooth grooves 75 and 76 are formed on the outer peripheral surface of the small-diameter pulley 56 at equal intervals in the circumferential direction. The number of teeth (for example, 20) of the large diameter tooth grooves 77 and 78 of the large diameter pulley 48 is set to be twice the number of teeth (for example, 10) of the small diameter tooth grooves 75 and 76 of the small diameter pulley 56.

  As shown in FIG. 9, the rotation operation unit 41 includes an operation dial 62 and a small diameter rotating body 54. Further, the transmission portion 79 includes a small-diameter pulley 56, a large-diameter pulley 48, and a transmission belt 80. In this configuration, when the operation dial 62 is rotated around its axis 62 a, the small-diameter pulley 56 rotates or rotates, and accordingly, the transmission belt 80 rotates, and with the rotation of the transmission belt 80, the large-diameter pulley 48. Is rotated or rotated by being connected to the small-diameter pulley 56 around the axis 48a. As shown in FIG. 7, teeth 80 a that fit into grooves 76 and 78 on the outer peripheral surface of the large-diameter pulley 48 and the small-diameter pulley 56 are formed on the inner peripheral surface of the transmission belt 80. Is reliably transmitted to the large-diameter pulley 48. 5 to 7 show a cross section on the handle main body 11 side, but it protrudes slightly upward from the lower surface of the handle main body 12 so as to be able to contact the lower surface of the transmission belt 80. The sliding surfaces 11b and 12b are formed, and the transmission belt 80 slides on the sliding surfaces 11b and 12b, thereby suppressing the vibration of the transmission belt 80. In addition, although the cross section by the side of the handle | body main part 12 is abbreviate | omitted, the handle | body main-body part 12 also has the sliding surface 12b of the structure similar to the above, and about these codes | symbols, it represents also using these figures. .

The pitch angle E1 of the teeth 55a formed on the outer peripheral portion of the regulated portion 55 provided integrally with the small diameter pulley 56, the number of teeth Z1 of the teeth 75 of the small diameter pulley 56, the pitch angle E2 of the teeth 51 of the lock plate 50, The relationship with the number of teeth Z2 of the teeth 77 of the large pulley 48 is
Z2 / E1 = Z1 / E2 (1)
Is related to. In other words, the ratio between the pitch angle E1 of the teeth 55a of the regulated portion 55 and the number of teeth Z2 of the large diameter pulley 48, and the ratio of the pitch angle E2 of the teeth 51 of the lock plate 50 and the number of teeth Z1 of the small diameter pulley 56 are Are set to be the same.

  As shown in FIGS. 8 and 9, the lock mechanism 36 includes a link member 95 as a moving member, an operating body 81 as a moving operation member that moves the link member 95 in the axial direction, and a distal end of the link member 95. The formed lock piece 100 as the first engaging portion, the lock plate 50 in which the lock piece 100 is fitted and removed from the groove 52, and a compression spring 106 (coil spring) for urging the link member 95 in the axial direction. It is composed of The operation body 81 locks (blocks) rotation around the axis of the lock plate 50 (same as the axis 48a of the large-diameter pulley 48) or allows rotation around the axis (releases the lock). In order to perform the operation, the user performs a turning operation. The operating body 81 is positioned between the large-diameter pulley 48 and the small-diameter pulley 56 in the middle of the upper surface of the first handle portion 2A, and an operating piece 81A that is gripped and operated by the user, and is integrated with the operating piece 81A. And a pivot piece 84 having a pivot base 83 that pivots around a pivot fulcrum member 82 along the width direction provided in the first handle 2A by operating the manipulation piece 81A. A long hole 85 in the axial direction that allows the turning piece 84 to turn around the turning fulcrum member 82 is formed in the handle body portions 11 and 12, and the turning piece 84 is inserted into the long hole 85. Further, restricting portions 86 and 87 for restricting the turning range of the turning piece 84 are formed on both axial sides of the long holes 85 of the handle body portions 11 and 12. The rotation base 83 is formed in a plate shape having a substantially rectangular shape (substantially trapezoidal shape) when viewed from the front. The rotation fulcrum member 82 is disposed at a position eccentric from the center of the rotation base 83 and is disposed along the width direction of the handle 2 on the axis 2a of the first handle 2A.

  The link member 95 is formed in a plate shape along the axial direction of the handle portion 2 while the rotation fulcrum member 82 penetrates freely and is disposed between the support shaft portion 33 and the small-diameter rotating body 54. Yes. The restriction portion 40 includes a compression spring 106, a restriction member 105, and the restricted portion 55.

  As shown in FIGS. 7 and 8, the operating body 81 has a release posture A in which the operation piece 81 </ b> A stands up with respect to the first handle 2 </ b> A, and rotates from the release posture A as shown in FIGS. 5 and 6. The operating piece 81 </ b> A is provided so as to be switchable to a locking posture B that is rotated around the moving fulcrum member 82 and tilted so as to follow the axis 2 a of the handle 2. Further, as shown in FIG. 9, a contact member 90 that protrudes in the width direction and contacts the peripheral surface of the rotation base 83 of the operating body 81 is formed on the inner peripheral surfaces of the handle main body portions 11 and 12. The contact member 90 is immovable in the axial direction. The rotation base 83 has its first contact surface 91 in contact with the axial side surface 90 a of the contact member 90 in the release posture A of the operation body 81, and its second contact surface 92 in the lock posture B of the operation body 81. The contact member 90 contacts the axial side surface 90a. The first contact surface 91 and the second contact surface 92 are continuous with an arcuate surface 93. The rotation fulcrum is set such that the distance L2 from the center of the rotation fulcrum member 82 to the first contact surface 91 is set larger than the distance L3 from the center of the rotation fulcrum member 82 to the second contact surface 92. The member 82 is disposed at a position eccentric from the center of the rotation base 83.

  A guide 96 that guides the link member 95 in the axial direction is arranged inside the first handle 2A on the one axial side of the first handle 2A. The guide 96 guides the link member 95 only in the axial direction. Further, a guide cover 961 (only a part of which is shown) is attached to the guide 96 with a set screw 962 so that the link member 95 does not come off the guide 96. A lock piece 100 that fits and detaches in the groove 52 of the lock plate 50 with the movement of the link member 95 accompanying the turning operation of the operating body 81 is provided at one end portion in the axial direction of the link member 95, that is, the front end portion on the head side. Is formed. As shown in the enlarged view of FIG. 12, the lock piece 100 is reduced in the vertical direction as compared with the plate-like main body 95 </ b> A of the link member 95 so as to be formed in a substantially similar shape to the groove 52 of the lock plate 50. Both sides of the distal end of the lock piece 100 have an arc shape 100a. The lock piece 100 has inclined contact surfaces 100b that contact the inclined surfaces 52a on both sides in the circumferential direction of the groove 52 (tooth 51) from the axial direction. The contact surface 100b and the main body 95A of the link member 95 are continuous with a curved shoulder portion 100c.

  A seat surface portion 103 that is bent in a direction substantially perpendicular to the main body 95A toward one side in the width direction of the handle portion 2 is formed at the other axial end of the main body 95A of the link member 95. Between the seat surface portion 103 and the outer peripheral surface of the regulated portion 55, a regulating member 105 that can contact the outer circumferential surface of the regulated portion 55, and a direction in which the regulating member 105 and the link member 95 are separated in the axial direction. And the compression spring 106 for biasing to the position. A guide portion 97 that guides the regulating member 105 and the compression spring 106 in the axial direction is integrally provided on the inner side surface of the handle body portion 11. The restricting member 105 is integrally formed on one side in the axial direction of the tip portion 107 and bulges in the width direction on the other side in the axial direction. The seat surface portion 104 and the guide portion 108 inserted into the compression spring 106 are integrally formed of synthetic resin.

  Further, a blocking piece 102 is provided to prevent the regulating member 105 from moving to the other side in the axial direction. The blocking piece 102 is disposed between the seat surface portion 104 and the regulated portion 55 and is integrally formed so as to protrude in the width direction from the inner side surface of the handle body portion 11. The guide portion 97 includes the blocking piece 102, a side wall portion 110 arranged parallel to the blocking piece 102 on one axial side, and a top wall portion that connects the blocking piece 102 and the side wall portion 110 with each other at the top. 111 and a bottom wall portion 112 that connects the blocking piece 102 and the side wall portion 110 with each other between the lower portions, and is formed in a groove having a U-shaped cross section that opens on one side in the width direction. The blocking piece 102 is formed with a concave portion 102 a that guides the middle of the distal end portion 107 from one side in the width direction to the other side. The seat surface portion 103 of the link member 95 is inserted into the guide portion 97, the compression spring 106 is extended toward the other side in the axial direction with the seat surface portion 103 as one seat surface, and the guide portion 108 of the regulating member 105 is extended to the compression spring 106. The compression spring 106 is inserted, the seat surface portion 104 of the restricting member 105 is the other seat surface, and the tip portion 107 of the restricting member 105 is loosely fitted in the recess 102a.

  In the above configuration, by operating the operation piece 35 located on the near side with respect to the user in the second handle portion 2B, for example, by sliding, the main switch (not shown) is turned on, and the motor 21 is driven. The drive mechanism 30 is driven and the movable blades 7 and 8 reciprocate. Then, the user can hold the handle 2 and lift the entire cutting device 1 so that the cutting blade 3 is applied to the branches and leaves at a high place to cut off the leaves.

  By the way, at the time of such branch and leaf trimming work, it is necessary to fix the cutting blade portion 3 against the handle portion 2 so as not to rotate against the intention of the user for safety. That is, in the lock posture B in which the operating body 81 is tilted along the axis 2a of the first handle 2A, as shown in FIGS. 5, 6, and 12 (imaginary line), the lock piece 100 of the lock mechanism 36 is Since the link member 95 is engaged with one of the grooves 52 of the lock plate 50 and the link member 95 is pressed to one side in the axial direction by the compression spring 106 of the lock mechanism 36, the head 5, that is, the cutting blade portion 3 is A state in which a constant inclination angle θ is held with respect to the handle 2, that is, in a locked state, and prevents the head 5 and the cutting blade 3 from rotating with respect to the handle 2. Therefore, safety is ensured. Further, the second contact surface 92 of the rotation base 83 is in contact (solid contact) with the axial side surface 90 a of the contact member 90, and the link member 95 and the rotation fulcrum member 82 are compressed by the compression spring 106. It is pressed to one side in the axial direction. Further, the rotation fulcrum member 82 is disposed on the axis 2a of the first handle 2A (also on the axis of the link member 95). Therefore, even if the elasticity of the compression spring 106 acts on the rotation fulcrum member 82 via the link member 95, it works only as a force that presses the link member 95 to one side in the axial direction. It is not a moment force that rotates 83 around the rotation fulcrum member 82. Therefore, by setting the operating body 81 to the lock posture B, it is ensured that the lock piece 100 is securely fitted in one of the grooves 52 of the lock plate 50 from the axial direction, so that the head 5 (drive unit 4), Even if the cutting blade portion 3 has a certain weight, the cutting blade portion 3 is reliably held at a predetermined inclination angle θ with respect to the handle portion 2.

  By the way, there is a case where it is desired to change the inclination angle θ of the cutting blade portion 3 with respect to the handle portion 2 for the position of branches and leaves and ease of use by the user. In this case, the operating body 81 is rotated clockwise D2 around the rotation fulcrum member 82 from the lock posture B tilted so as to follow the axis 2a of the handle portion 2, and is shown in FIGS. In this way, the operation piece 81 </ b> A is in a release posture A in which the operation piece 81 </ b> A stands up with respect to the handle 2. When the operating body 81 is changed from the lock posture B to the release posture A, in the lock posture B, the second contact surface 92 of the rotation base 83 is in contact with the axial side surface 90 a of the contact member 90. However, when the operating body 81 is rotated in the clockwise direction D2 around the rotation fulcrum member 82 from the lock posture B to the release posture A, the second contact surface 92 is rotated so as to be separated from the axial side surface 90a of the contact member 90. It rotates in the clockwise direction D2 around the moving fulcrum member 82, and at the same time, the arcuate surface 93 rotates in the clockwise direction D2 around the rotating fulcrum member 82 while sliding on the axial side surface 90a of the contact member 90. When the arcuate surface 93 leaves the axial side surface 90a of the abutting member 90, the first abutting surface 91 abuts against the axial side surface 90a of the abutting member 90 (solid contact), and the operating body 81 is locked. The release posture A rises from the posture B.

  Since the distance L2 from the rotation fulcrum member 82 to the first contact surface 91 is set larger than the distance L3 from the rotation fulcrum member 82 to the second contact surface 92, the operating body 81 is locked. When switching from B to the release posture A, the link member 95 moves to the other side in the axial direction, which is the direction in which the compression spring 106 is contracted in the axial direction, and the compression spring 106 receives a large amount of axial force. The force that presses the regulating member 105 to the other side in the axial direction increases accordingly. Here, when the operating body 81 is changed from the lock posture B to the release posture A, the first contact surface 91 of the rotation base 83 contacts the axial side surface 90a of the contact member 90, and the rotation fulcrum member 82 is a link member. Even if the elastic force of the compression spring 106 acts on the rotation base 83 of the operating body 81 via the link member 95, this rotates the link member 95, particularly the rotation base 83. It is not a moment force that rotates around the fulcrum member 82, and therefore it is possible to reliably prevent the operating body 81 from returning to the lock posture B.

  Incidentally, as described above, in the release posture A of the operating body 81, the compression spring 106 contracts compared to the lock posture B, and the force that presses the regulating member 105 to the other side in the axial direction increases accordingly. Therefore, if there is no blocking piece 102, the compression spring 106 moves to the small diameter rotating body 54 side. Therefore, even if the compression spring 106 contracts due to the presence of the blocking piece 102, it does not move to the other side in the axial direction. However, when the operating body 81 is set to the release posture A, the load acting on the compression spring 106 strongly presses the seat surface portion 104 of the regulating member 105 toward the other side in the axial direction. As a result, the distal end portion 107 (having a hemispherical distal end) of the restricting member 105 strongly presses the outer peripheral surface of the restricted portion 55 with a predetermined pressing force, so that the restricted portion 55 rotates about its axis. Be regulated. The regulated portion 55 and the small-diameter pulley 56 rotate integrally, the small-diameter pulley 56 and the large-diameter pulley 48 are connected by a transmission belt 80, and the large-diameter pulley 48 and the head 5 rotate integrally. When the rotation of the restricted portion 55 is restricted, the head 5, that is, the cutting blade portion 3, can be restricted from rotating with respect to the handle portion 2 due to its own weight.

  Here, as shown in FIG. 11, tooth grooves 55 a and 55 b are formed on the outer peripheral surface of the regulated portion 55, so that when the operating body 81 is released from the locked posture B to the released posture A, the tip of the regulating member 105 The case where the part 107 contacts the outer peripheral surface of the tooth 55a and the case where the part 107 enters the groove 55b are assumed. When the distal end portion 107 of the regulating member 105 contacts the outer peripheral surface of the tooth 55a, a restriction force corresponding to the elastic force of the compression spring 106 (in this case, when the distal end portion 107 contacts the outer peripheral surface of the tooth 55a). ), The posture of the cutting blade portion 3 is regulated. When the distal end portion 107 of the restricting member 105 enters the groove 55b, the engaging force between the distal end portion 107 and the groove 55b is added to the elastic force of the compression spring 106, and the rotation operation of the cutting blade portion 3 is more reliably restricted. And safety can be ensured. Thus, even when the operating body 81 is set to the release posture A and the lock piece 100 is separated from the groove 52 of the lock plate 50, the cutting blade portion 3 is rotated with respect to the handle portion 2 with a predetermined frictional force. Therefore, when the inclination angle θ of the cutting blade portion 3 with respect to the handle portion 2 is to be changed, the cutting blade portion 3 and the head 5 rotate around the support shaft portion 33 by their own weight against the user's will. It can be prevented from moving.

  Next, for example, the user releases the locked state of the head 5 by grasping the handle 2 with one hand and releasing the operating body 81 from the locked position B with the other hand as described above. After that, the operation dial 62 is grasped with the other hand and is rotated against the elasticity of the compression spring 106. At this time, since the grip operating portion 63 of the operation dial 62 is formed with a larger diameter than the small diameter pulley 56, the small diameter pulley 56 can be easily rotated by rotating the operation dial 62. Here, if the operating body 81 is released from the locking posture B to the releasing posture A, the tip portion 107 of the regulating member 105 is in contact with the outer peripheral surface of the tooth 55a. The tip portion 107 is fitted into the groove 55b of the regulated portion 55. At this time, since the regulating member 105 is pressed by the compression spring 106, when the front end portion 107 is fitted into the groove 55b, for example, the user feels when fitting. Or the fitting sound at the time of the front-end | tip part 107 fitting to the groove | channel 55b generate | occur | produces.

  The user further rotates the operation dial 62 against the elastic force of the compression spring 106 and the fitting force between the distal end portion 107 and the groove 55b, whereby the small-diameter pulley 56 rotates around its axis 62a. As for the relationship between the restricting member 105 and the distal end portion 107, the distal end portion 107 repeats the press fitting such as the teeth 55a, the grooves 55b, the teeth 55a, the grooves 55b. It is done. When the small-diameter pulley 56 is rotated, the large-diameter pulley 48 connected to the small-diameter pulley 56 via the transmission belt 80 rotates at a smaller angle than the small-diameter pulley 56. Therefore, the user can turn the cutting blade portion 3 with respect to the handle portion 2 by a necessary angle and finely adjusting the angle.

  When the user rotates the cutting blade portion 3 by a desired angle, the user returns the operating body 81 from the release posture A to the lock posture B again. Then, the operating body 81 is locked while the arcuate surface 93 is in sliding contact with the axial side surface 90a from the state in which the first contact surface 91 of the rotation base 83 is in contact with the axial side surface 90a of the contact member 90. In the state of B, the second contact surface 92 contacts the axial side surface 90a. Since the distance L3 from the rotation fulcrum member 82 to the second contact surface 92 and the distance L2 from the first contact surface 91 are set as described above, the rotation base 83 is the rotation fulcrum member 82. When rotating about the counterclockwise direction D1, the link member 95 is guided toward the one side in the axial direction by the guide 96. Then, the lock piece 100 at the tip of the link member 95 is fitted into the groove 52 of the lock plate 50 as the link member 95 is moved, whereby rotation of the lock plate 50 around the axis is prevented and integrated with the lock plate 50. Therefore, the cutting blade 3 is fixed to the handle 2 at a predetermined inclination angle θ. The lock piece 100 has an inclined contact surface 100b that contacts the inclined surfaces 52a on both sides in the circumferential direction of the groove 52 from the axial direction. When the lock piece 100 is fitted into the groove 52, the lock piece 100 is formed on the inclined surface 52a. By the contact of the inclined contact surface 100b, it is possible to effectively prevent the head 5 from rattling. Further, the inclined surface 52 a serves as a guide when the lock piece 100 is fitted into the groove 52, and guides the lock piece 100 so that it can easily enter the groove 52. Since both sides of the distal end portion of the lock piece 100 are formed in an arc shape 100a, the lock piece 100 is configured to enter the groove 52 more smoothly.

By the way, as described above, the pitch angle E1 of the teeth 55a formed on the outer peripheral portion of the regulated portion 55 provided integrally with the small diameter pulley 56, the number of teeth Z1 of the teeth 75 of the small diameter pulley 56, and the teeth 51 of the lock plate 50. The pitch angle E2 and the number of teeth Z2 of the teeth 77 of the large-diameter pulley 48 are as follows:
Z2 / E1 = Z1 / E2 (1)
Is related to. Since the relationship among E1, Z1, E2, and Z2 is set in this way, when the tip portion 107 of the regulating member 105 is fitted into the groove 55b of the regulated portion 55, the operating body 81 is locked in that state. When the link member 95 is moved to one side in the axial direction by operating in B, the lock piece 100 is fitted into the groove 52 of the lock plate 50. As described above, when the distal end portion 107 is fitted into the groove 55b, for example, the user feels when fitting, or a fitting sound is generated. By setting 81 to the lock posture B, it can be known that the lock piece 100 is securely fitted in the groove 52 of the lock plate 50. Therefore, the user can perform the mowing work without anxiety about whether or not the locked state has been reached. Further, since the operating body 81 is provided in the handle portion 2 and in front of the head 5, and the operation dial 62 is provided further in front, the adjustment of the inclination angle θ of the cutting blade portion 3 as described above. Is a work that is possible even when the user is holding the handle 2 of the brush cutter 1 and is performing the brush cutting work on the branches and leaves at a high place.

  A compression spring 106 is disposed between the blocking piece 102 of the guide portion 97 and the seat surface portion 103 of the link member 95, and presses the regulating member 105 to the other side in the axial direction. By moving 81 from the release posture A to the lock posture B, the link member 95 moves to one side in the axial direction, and the compression spring 106 extends in the axial direction. Therefore, the elastic force with which the compression spring 106 presses the restriction member 105 is weaker than the restriction force described above. However, even if the operating body 81 is thus locked from the unlocked position A to the locked position B, the compression member 106 presses the regulating member 105 to the other side in the axial direction. In this case, the compression spring 106 can apply the regulating force to the regulated portion 55 with good reactivity via the regulating member 105.

  As described above, when the user changes the inclination angle θ of the cutting blade portion 3 with respect to the handle portion 2, the user grasps the handle portion 2 with one hand and releases the operating body 81 from the lock posture B with the other hand. Take the posture A, hold the operation dial 62 with the other hand, rotate it and rotate the operating body 81 to the locked posture B again with the other hand. It is possible to change the inclination angle to an inclination angle θ that facilitates the brushing operation.

  Further, when the operation dial 62 is attached to the attachment portion 57 by the screw member 74, the operation dial 62 has the width B3 that hardly protrudes from the width direction maximum protrusion 31a of the head 5 and the width direction maximum protrusion 31a of the head 5. Since it is attached to the handle part 2 so as not to protrude from the head, for example, even when performing a brush cutting operation at the time of cutting, there is no portion protruding in the width direction from the head 5 which has existed conventionally. Therefore, even if the operation dial 62 is specially provided on the handle portion 2 as in this embodiment, it is possible to prevent a decrease in workability at the time of the mowing work.

  The large diameter pulley 48 and the small diameter pulley 56 are connected by a transmission belt 80. Therefore, by using the transmission belt 80 having different axial lengths, the operation dial 62 can be further arranged on the near side, and in this case, the usability can be further improved. Furthermore, by changing the diameter ratio between the large-diameter pulley 48 and the small-diameter pulley 56, it is possible to adjust the rotational operation force necessary for rotating the operation dial 62 to be light. Needless to say, the diameter of the operation dial 62 can be set to a diameter that is easy for the user to handle (easy to rotate), and if the diameter of the operation dial 62 is increased, the cutting blade has a smaller rotational operation force. The part 3 can be rotated.

  In the above-described embodiment, the operation of the restricting unit 40 is interlocked with the operation of the lock mechanism 36, but is not limited thereto. That is, at least when the operation lever 81 is in the release posture A, it is only necessary to avoid a state in which the head 5 (the cutting blade portion 3) is free with respect to the handle portion 2. The compression spring 106 may be arranged on the other side in the axial direction of the restricted portion 55 so that a predetermined rotation restricting force is always applied to the restricted portion 55 with a constant elastic force. That is, it is the structure which regulates that the cutting blade part 3 rotates with respect to the handle | steering-piece part 2 with a predetermined | prescribed regulation force irrespective of a locked state and the unlocked state. Thus, safety can be ensured by applying a predetermined regulating force to the regulated portion 55 regardless of the attitude of the operation lever 81. Furthermore, in the above-described embodiment, the compression spring 106 is configured to indirectly apply a predetermined regulating force to the support shaft portion 33 via the regulating member 105, the small-diameter rotating body 54, and the transmission belt 80. However, the present invention is not limited to this. However, it is also possible to adopt a configuration in which the regulating force is directly applied to the support shaft portion 33.

  Furthermore, the large-diameter pulley 48 and the small-diameter pulley 56 are connected by the transmission belt 80. However, the present invention is not limited to this, and the large-diameter pulley 48 and the small-diameter pulley 56 are replaced by a chain instead of the transmission belt 80. May be connected and transmitted to rotate, or a gear may be engaged between the large diameter pulley 48 and the small diameter pulley 56 so that the large diameter pulley 48 and the small diameter pulley 56 are interlocked.

1 is an overall front view of a brush cutter apparatus in which a part of a handle portion of the brush cutter apparatus according to an embodiment of the present invention is omitted. It is the whole plan view of the brush cutter which abbreviate | omitted a part of handle part similarly. It is a partially expanded front view which similarly shows the rotation state of the head with respect to a handle | pattern part, and a cutting blade part. It is a partially omitted plan sectional view showing the principal part of the internal structure of a brush cutter. It is a partially expanded front sectional view showing the principal part of the internal structure. It is the front sectional view which similarly expanded further the principal part and made the operation lever into the locked posture. It is the enlarged front sectional view which made the operation lever into the release posture similarly. It is the enlarged front sectional view similarly drawn centering on the operation lever. It is an enlarged plane sectional view showing the composition of the whole principal part similarly. It is the enlarged view of the one side of a principal part similarly. It is the enlarged view of the other side of the principal part similarly. It is the elements on larger scale which similarly show the relationship between a lock plate and a lock piece.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Mowing apparatus, 2 ... Handle part, 3 ... Cutting blade part, 4 ... Drive part, 5 ... Head, 2A ... 1st handle part, 2B ... 2nd handle part, 30 ... Drive mechanism, 36 ... Lock mechanism, DESCRIPTION OF SYMBOLS 40 ... Restriction part, 41 ... Turning operation part, 48 ... Large diameter pulley, 50 ... Lock plate, 56 ... Small diameter pulley, 62 ... Operation dial, 81 ... Operation body, 81A ... Operation piece, 82 ... Turning fulcrum member 83: rotating base, 84: rotating piece, 100: lock piece, 95: link member, 105: regulating member, 106: compression spring

Claims (5)

  A handle portion (2) having a predetermined length in the axial direction, a cutting blade portion (3) disposed on one side in the axial direction of the handle portion (2) and having a predetermined length, and the cutting blade portion ( 3) and a drive part (4) for driving, the handle part (2) and the cutting blade part (3) relative to each other around the support shaft part (33) via the support shaft part (33). And a rotation operation part (41) for rotating the handle part (2) and the cutting blade part (3) relative to the support shaft part (33). The shaft portion (33) is provided on the other axial side of the handle portion (2) with respect to the cutting blade portion (3), and the cutting blade portion (3) and the rotation operation portion (41) serve as the transmission portion (79). A brush cutter device (1) characterized in that the brush cutter device is pivotally connected to the brush cutter device (1).   The handle part (2) and the cutting blade part (3) are connected via a head (5) with an internal drive part (4), and the width (B1) in the direction perpendicular to the axial direction of the head (5). Is formed larger than the width (B2) of the handle portion (2), and the rotating operation portion (41) includes a rotating body (54) provided in the handle portion (2) and a handle portion (2). And a rotation operation member (62) for operating the rotating body (54). The rotation operation member (62) is a maximum protrusion in the width direction of the head (5) ( The brush cutter (1) according to claim 1, characterized in that it is set so as not to protrude from 31a).   The cutting blade portion (3) is provided so as to be rotatable integrally with the support shaft portion (33), and a rotating body (54) that is rotated in accordance with the rotation operation of the rotation operation portion (41) is provided. The brush cutter (1) according to claim 1, wherein the diameter of the rotating body (54) is set smaller than the diameter of the support shaft (33).   The transmission portion (79) includes a small-diameter pulley (56) that is externally fitted to the rotating body (54), and a large-diameter pulley (48 that is externally fitted to the support shaft portion (33) and has a larger diameter than the small-diameter pulley (56). 4) and a transmission belt (80) for connecting and transmitting the small-diameter pulley (56) and the large-diameter pulley (48). There are uneven portions (52, 51) at predetermined intervals in the circumferential direction of the outer peripheral surface of the support shaft portion (33), and uneven portions (55b, 55a) are provided at predetermined intervals in the peripheral direction on the outer peripheral surface of the rotating body (54). And is movable in the axial direction of the handle portion (2) between the support shaft portion (33) and the rotating body (54), and the uneven portions (52, 51) of the support shaft portion (33). A moving member (95) having a first engaging portion (100) that engages with the second engaging portion (107) that engages with the concave and convex portions (55b, 55a) of the rotating body (54) is provided. A moving operation member (81) for moving the moving member (95) in the axial direction is provided,
In order to restrict the relative rotational movement of the handle part (2) and the cutting blade part (3) with a predetermined restricting force, the second engaging part (107) is formed on the uneven part of the rotating body (54). From the state of being engaged with (55b, 55a), the moving operation member (81) is operated to engage the first engaging portion (100) with the concave and convex portions (52, 51) of the support shaft portion (33). Then, when the relative rotation operation between the handle portion (2) and the cutting blade portion (3) is prevented, the first engaging portion (100) is provided with the uneven portion (52, 52) of the support shaft portion (33). 51) and the circumferential separation angle (E2) of the concavo-convex portions (52, 51) of the support shaft portion (33) and the circumferential separation angle (55b, 55a) of the concavo-convex portions (55b, 55a) of the rotating body (54). The brush cutter (1) according to claim 3 or 4, wherein E1) is related.

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