JP6097580B2 - Cord type brush cutter brush head - Google Patents

Description

  The present invention relates to a brush cutter head of a cord type brush cutter that cuts grass by rotating a flexible cord at high speed.

  In the cord type brush cutter, a nylon cord of a certain length is inserted into the brush head and the nylon cord is replaced, and a nylon cord of a predetermined length is fed out from the brush head and the nylon cord is fixed to a certain length. There is something to keep. As the brush head of the former cord type brush cutter, there is one shown in FIG. The brush cutting head 82 is rotatably attached to a gear box 81 attached to the distal end portion of the operation rod 80. Further, an outlet member 83 from which the nylon cord 84 is led out is integrally provided on the outer peripheral portion of the brush head 82. The nylon cord 84 is made of nylon of a certain length having a stopper 84a (see FIG. 12) at one end, and is inserted into the outlet member 83 from the brush head 82 and led out. In this brush cutting head 82, the nylon cord 84 is rotated at high speed in the direction of the arrow A and the grass is cut by rotating the brush cutting head 82 in the direction of the arrow A by a driving source such as a motor or an engine (not shown). Can do. When the nylon cord 84 is worn, a new nylon cord 84 is inserted into the outlet member 83 from the brush head 82 and replaced. As such a brush cutting head, there exists a thing described in patent document 1, for example.

  Further, as a brush head of the latter cord type brush cutter, there is one shown in FIG. The brush cutting head 92 is rotatably attached to a gear box 91 attached to the distal end portion of the operating rod 90. Further, an outlet member 93 from which the nylon cord 94 is led out is provided on the outer peripheral portion of the brush head 92. The nylon cord 94 is wound around a reel (not shown) built in the brush head 92, and the leading end is led out from the outlet member 93. A striking member 95 projects downward from the bottom of the brush head 92. In this brush cutting head 92, when the brush cutting head 92 is rotated in the direction of arrow B by a driving source (not shown), the nylon cord 94 is rotated at a high speed in the direction of arrow B and the grass can be cut. Then, when the nylon cord 94 is worn, the nylon cord 94 of a predetermined length is fed out from the outlet member 93 by hitting the hitting member 95 against the ground, and the nylon cord 94 is kept at a certain length. . As such a brush cutting head, there exists a thing described in patent document 2, for example.

JP 2007-135418 A (FIGS. 3 and 4) JP 2002-291315 A

  However, in the brush head described in Patent Document 1, the nylon cord 84 is subjected not only to grass but also to stones on the ground, small-diameter miscellaneous trees, and the like during mowing work, and receives a heavy load. Then, as shown in FIG. 12, the nylon cord 84 is bent in the direction opposite to the rotation direction indicated by the arrow A. However, FIG. 12 is an enlarged cross-sectional view of the brush cutting head 82 cut along a plane parallel to the rotation surface. Here, in particular, in the opening 83a of the outlet member 83, the nylon cord 84 is greatly bent and receives a concentrated load. Thus, the nylon cord 84 wears earlier at the portion of the outlet member 83 that contacts the opening 83a than the other portions, and is easily cut at this portion. For this reason, the nylon cord 84 must be replaced at an early stage, causing a problem in durability.

  Also in the brush head described in Patent Document 2, as in the brush head 82, the portion where the nylon cord 94 abuts against the opening 93a of the outlet member 93 wears faster than the other portions, as shown in FIG. Therefore, there was a problem with its durability. Further, in the brush cutting head 92, when the nylon cord 94 is cut at the opening 93 a of the outlet member 93, the distal end portion of the cut nylon cord 94 is cut by the centrifugal force received by the nylon cord 94 in the brush cutting head 92. It becomes easy to enter the paying head 92. When such a situation occurs, the nylon cord 94 having a predetermined length is not fed out from the outlet member 93 even if the hitting member 95 is hit against the ground. Therefore, the brush head 92 must be disassembled, the reel taken out, and the nylon cord 94 re-wound around the reel, and then reassembled.

  The present invention has been made in view of the above-described conventional problems, and provides a brush cutter head of a cord type brush cutter capable of improving the durability of the cord.

  In order to solve the above-described problem, the cord type brush cutter head according to claim 1 is characterized in that in the cord type brush cutter head for cutting grass by rotating a flexible cord at high speed, The brush cutter head is rotatably attached to a gear box attached to the tip of the operating rod, and the cord is led out from an outlet member provided on the outer periphery of the brush cutter head, and the outlet member is That is, the brush head is provided so as to be rotatable around the axis of the support shaft provided perpendicular to the rotation surface of the brush head.

Further, a lead-out hole through which the cord is led out is provided at the center of the outlet member, and the two support shafts have the same axis center on the outer side in the direction perpendicular to the lead-out hole of the outlet member. And an attachment hole to which the outlet member is attached is provided on the outer peripheral portion of the brush head, and the attachment hole has two shaft holes that can support the support shaft. It is provided perpendicularly to the rotation surface of the brush head.

Features of Kari払head code trimmer according to claim 2, before Symbol outlet member includes a first member comprising the support shaft, and a second member which is fitted to the first member includes the outlet hole The first member and the second member are made of different materials.

According to a third aspect of the present invention, there is provided a cord-type brush cutter having a cord-cut brush cutter head including the cord wound around a reel, and a leading end portion of the cord being led out from the outlet member. That is.

  In the brush head of the cord type brush cutter according to the first aspect, the outlet member is provided so as to be rotatable around the axis of the support shaft provided perpendicular to the rotation surface of the brush head. Therefore, when the nylon cord hits the surface stone or small-diameter miscellaneous tree during the mowing operation and rotates in the direction opposite to the rotation direction of the brush head, the outlet member also rotates in the direction opposite to the rotation direction of the brush head. As a result, the nylon cord is not greatly bent at the opening of the outlet member, and the load is not concentrated on this portion. Therefore, according to the brush head of this cord type brush cutter, the durability of the cord can be improved.

Furthermore, a lead-out hole through which the cord is led out is provided in the center of the outlet member, and two support shafts have the same axial center and project in the opposite direction on the outer side in the direction perpendicular to the lead-out hole of the outlet member. Has been. Further, an attachment hole to which the outlet member is attached is provided on the outer peripheral portion of the brush head, and two shaft holes that can support the support shaft are provided perpendicular to the rotation surface of the brush head. Yes. Thereby, the exit member which can be rotated around the axis of the support shaft with a simple structure can be manufactured.

In the brush cutter head of the cord type brush cutter according to claim 2 , the outlet member includes a first member including a support shaft and a second member including a lead-out hole and fitted into the first member. And the second member are made of different materials. Therefore, if a lightweight resin or the like is used as the material of the first member and hard aluminum or ceramic is used as the material of the second member, the durability of the cord can be improved and the cord outlet of the outlet member can be improved. The durability of the part can also be improved, and cost reduction and weight reduction can be realized.

According to a third aspect of the present invention , a cord brush cutter includes a cord wound around a reel, and a leading end portion of the cord is led out from an outlet member. In such a brush cutting head, it is difficult for the cord to be cut at the opening of the outlet member, and complicated work of disassembly, rewinding, and reassembly is reduced, and work efficiency can be improved.

FIG. 3 is a perspective view of the brush head according to the first embodiment. FIG. 3 is an exploded perspective view of the brush head according to the first embodiment. FIG. 3 is a partial cross-sectional view of a cord type brush cutter using the brush cutter head according to the first embodiment. The perspective view at the time of a work concerning the cord type brush cutter using the brush head of Embodiment 1. The perspective view of an exit member in connection with the brush cutting head of Embodiment 1,2. FIG. 4 is an exploded perspective view of an outlet member according to the brush cutter head according to the first and second embodiments. FIG. 6 is a perspective view of a brush cutter head according to a second embodiment. FIG. 4 is an exploded perspective view of a brush cutter head according to a second embodiment. The perspective view at the time of a work concerning the cord type brush cutter using the brush head of Embodiment 2. The perspective view of the cord type brush cutter using the conventional brush cutter head. The perspective view of the cord type brush cutter using the conventional brush cutter head. A partial expanded sectional view of the conventional brush cutter head.

  A first embodiment and a second embodiment in which a cord brush cutter according to the present invention is embodied will be described below with reference to the drawings. However, in Embodiment 1 and Embodiment 2, the same symbols are used for the same configurations as those in FIGS. 10 and 11. First, the brush cutter head according to the first embodiment will be described. FIG. 1 is a perspective view of the brush head 1 according to the first embodiment, and FIG. 2 is an exploded perspective view of the brush head 1. As shown in FIG. 1, the brush head 1 has a cover 2, a housing 3, an outlet member 7, and a nylon cord 8. Moreover, the attachment hole 6 to which the outlet member 7 is attached is formed by assembling the cover 2 and the housing 3. Here, the nylon cord 8 is a “cord”.

  The configuration of the brush head 1 will be described in detail with reference to FIG. The cover 2 has a disk shape, and four shaft holes 2 a are provided in the circumferential portion perpendicular to the rotation surface of the brush head 1. The housing 3 includes a main body portion 4 having a thin, covered cylindrical shape, and a flange portion 5 that protrudes outward from the lower end of the main body portion 4 over the entire circumference. And in the outer peripheral part of the main-body part 4, the four insertion windows 4a are provided in the shape of a long hole. In addition, the flange portion 5 is provided with four shaft holes 5 a at positions corresponding to the shaft holes 2 a of the cover 2 in a direction perpendicular to the rotation surface of the brush head 1. A support shaft 7a described later is pivotally supported by the shaft holes 2a and 5a.

  The outlet member 7 has a rectangular parallelepiped shape, and a lead-out hole 7b through which the nylon cord 8 is led out is provided at the center. In addition, two support shafts 7a have the same axis and project in opposite directions on the outer side in the direction perpendicular to the outlet hole 7b of the outlet member 7. The nylon cord 8 includes a cord-shaped cord body 8a and a stopper 8b provided at one end of the cord body 8a. The stopper 8b can prevent the nylon cord 8 from coming off the brush head 1 when the brush head 1 rotates.

  In the brush cutting head 1, the support shafts 7 a of the four outlet members 7 are pivotally supported in shaft holes 2 a and 5 a provided perpendicular to the rotation surface of the brush cutting head 1. Therefore, the support shaft 7a is attached perpendicularly to the rotation surface of the brush head 1, and the outlet member 7 is rotatable around the axis of the support shaft 7a. The nylon cord 8 is attached to the housing 3 by inserting the tip end (the side opposite to the stopper 8b) of the cord body 8a into the insertion window 4a and the lead-out hole 7b from the inside of the housing 3.

  As shown in FIG. 3, the brush cutter head 1 is rotatably attached to a gear box 81 attached to the distal end portion of the operating rod 80, and the cord type brush cutter is completed. In this cord type brush cutter, when the nylon cord 8 is worn, a new nylon cord 8 can be exchanged by inserting it into the insertion window 4a and the outlet hole 7b from the inside of the housing 3.

  As shown in FIG. 4, in the brush cutting head 1, when the brush cutting head 1 is rotated in the direction of the arrow C by the driving source, the nylon cord 8 is rotated at high speed in the direction of the arrow C to cut grass. Can do. When the nylon cord 8 hits a ground stone or a small-diameter miscellaneous tree during the mowing operation and is rotated in the direction opposite to the arrow C, the outlet member 7 is also rotated in the direction opposite to the arrow C.

  Further, in the brush cutter head 1, an outlet member 10 shown in FIG. 5 can be adopted instead of the outlet member 7. The outlet member 10 includes a first member 11 including support shafts 11a and 11b, and a second member 12 including a lead-out hole 12b and fitted into the first member 11. As shown in FIG. 6, the first member 11 is a resin-made rectangular parallelepiped, and an insertion hole 11 c into which the second member 12 is inserted is provided at the center. Further, two support shafts 11a and 11b are provided on the outer side in the direction perpendicular to the insertion hole 11c of the first member 11 so as to protrude in the opposite directions with the same axis. The second member 12 includes a main body portion 12a that is a rectangular parallelepiped made of aluminum, and a flange portion 12c that protrudes outward from the main body portion 12a. The lead-out hole into which the nylon cord 8 is led out. 12b is penetrated. The main body 12a of the second member 12 is inserted into the insertion hole 11c of the first member 11, and the outlet member 10 shown in FIG. 5 is completed. In addition, in order to make it easy to assemble the first member 11 and the second member 12, slits are cut from the upper portions of the first member 11 and the second member 12.

  In the brush head 1 according to the first embodiment, the outlet member 7 is provided so as to be rotatable around the axis of the support shaft 7 a provided perpendicular to the rotation surface of the brush head 1. Therefore, when the nylon cord 8 hits a ground stone or small-diameter miscellaneous tree during the mowing operation and is rotated in the direction opposite to the rotation direction of the brush head 1, the outlet member 7 is also in the direction opposite to the rotation direction of the brush head 1. Rotate to. As a result, the nylon cord 8 is not greatly bent at the opening of the outlet member 7 and is not subjected to a concentrated load at this portion. Therefore, according to the brush head 1 of Embodiment 1, the durability of the nylon cord 8 can be improved.

  Further, in this brush cutting head 1, a lead-out hole 7b through which the nylon cord 8 is led out penetrates the central part of the outlet member 7, and two support shafts 7a are provided on the outer side in the direction perpendicular to the lead-out hole 7b of the outlet member 7. Have the same axis and project in opposite directions. Further, an attachment hole 6 to which the outlet member 7 is attached is provided in the outer peripheral portion of the brush cutting head 1, and the cover 2 and the housing 3 constituting the attachment hole 6 have two shafts that can support the support shaft 7a. Holes 2 a and 5 a are provided perpendicular to the rotation surface of the brush head 1. Thereby, it is possible to manufacture the outlet member 7 that can rotate around the axis of the support shaft 7a with a simple structure.

  Further, in the brush cutter head 1, the outlet member 10 can be employed instead of the outlet member 7. The outlet member 10 includes a first member 11 including support shafts 11a and 11b, and a second member 12 including a lead-out hole 12b and fitted into the first member 11. Therefore, if a lightweight resin or the like is used as the material of the first member 11 and a hard aluminum or ceramic is used as the material of the second member 12, the durability of the nylon cord 8 can be improved and the outlet can be improved. The durability of the cord outlet portion of the member can also be improved, and cost reduction and weight reduction can be realized.

  Next, the brush cutter head according to the second embodiment will be described. FIG. 7 is a perspective view of the brush head 20 according to the second embodiment, and FIG. 8 is an exploded perspective view of the brush head 20. As shown in FIG. 7, the brush cutting head 20 has a housing 21, a cover 28, an outlet member 27, and a nylon cord 26 led out from the outlet member 27. Further, a striking member 25a protrudes downward from the bottom of the cover 28. Here, the nylon cord 26 is a “cord”.

  The configuration of the brush head 20 will be described in detail with reference to FIG. The housing 21 has a thin-walled cylindrical shape, and includes a lid portion 22 and a cylindrical portion 23 formed integrally with the lid portion 22. At two locations of the cylindrical portion 23, mounting holes 23a to which the outlet members 27 are attached are provided, and shaft holes 23b are recessed in the upper part of the mounting holes 23a so as to be perpendicular to the rotation surface of the brush head 20. Further, the cover 28 has a substantially disk shape, and two shaft holes 28 a are provided perpendicular to the rotation surface of the brush head 20 at positions corresponding to the shaft holes 22 b of the housing 21. A support shaft 27a described later is pivotally supported by the shaft holes 23b and 28a.

  In the housing 21, a nut 24a, a spring 24b, a reel 25 having a hitting member 25a, and a nylon cord 26 are accommodated. The nut 24 a attaches the housing 21 to the gear box 91 (see FIG. 9), and the spring 24 b pushes the reel 25 and the cover 28 in a direction away from the housing 21. A nylon cord 26 is wound around the outer peripheral surface of the reel 25, and the leading end of the nylon cord 26 is led out from two outlet members 27 attached to the housing 21 and the cover 28.

  The outlet member 27 has a rectangular parallelepiped shape, and a lead-out hole 27b through which the nylon cord 26 is led is penetrating in the center. Further, two support shafts 27a have the same axis and project in opposite directions on the outer side in the direction perpendicular to the outlet hole 27b of the outlet member 27. In the brush cutting head 20, the support shafts 27 a of the two outlet members 27 are pivotally supported in shaft holes 23 b and 28 a provided perpendicular to the rotation surface of the brush cutting head 20. Therefore, the support shaft 27a is attached perpendicularly to the rotation surface of the brush head 20, and the outlet member 27 is rotatable around the axis of the support shaft 27a.

  As shown in FIG. 9, the brush cutter head 20 is rotatably attached to a gear box 91 attached to the tip of the operating rod 90, and the cord type brush cutter is completed. In this cord type brush cutter, when the nylon cord 26 is worn, the nylon cord 26 of a predetermined length is fed out from the outlet member 27 by hitting the hitting member 25a against the ground so that the nylon cord 26 has a certain length. It will be kept. Further, in this brush cutting head 20, when the brush cutting head 20 is rotated in the direction of the arrow D by the drive source, the nylon cord 26 is rotated at a high speed in the direction of the arrow D and the grass can be cut. When the nylon cord 26 hits a ground stone or small-diameter miscellaneous tree during the mowing operation and is rotated in the direction opposite to the arrow D, the outlet member 27 also rotates in the direction opposite to the arrow D. Further, in this brush cutting head 20, the outlet member 10 shown in FIGS. 5 and 6 can be employed instead of the outlet member 27 as in the case of the first embodiment.

  In the brush head 20 according to the second embodiment, the outlet member 27 is provided so as to be rotatable around the axis of the support shaft 27 a provided perpendicular to the rotation surface of the brush head 20. Therefore, when the nylon cord 26 hits the surface stone or small-diameter miscellaneous tree during the mowing operation and is rotated in the direction opposite to the rotation direction of the brush head 20, the outlet member 27 is also in the direction opposite to the rotation direction of the brush head 20. Rotate to. As a result, the nylon cord 26 is not greatly bent at the opening of the outlet member 27 and is not subjected to concentrated loads at this portion. Therefore, according to the brush head 20 of the second embodiment, the durability of the nylon cord 26 can be improved.

  Further, in the brush cutting head 20, a lead-out hole 27b through which the nylon cord 26 is led out is provided in the center of the outlet member 27, and two support shafts 27a are provided on the outer side in the direction perpendicular to the lead-out hole 27b of the outlet member 27. Have the same axis and project in opposite directions. Further, an attachment hole 23a to which the outlet member 27 is attached is provided in the outer peripheral portion of the brush head 20, and the housing 21 and the cover 28 have two shaft holes 23b and 28a that can support the support shaft 27a. It is provided perpendicular to the rotation surface of the head 20. Thereby, it is possible to manufacture the outlet member 27 that can rotate around the axis of the support shaft 27a with a simple structure.

  Further, in the brush cutter head 20, the outlet member 10 can be employed instead of the outlet member 27 as in the first embodiment. The effect of adopting the outlet member 10 is the same as that of the first embodiment.

  As mentioned above, although the brush cutter head of the cord type brush cutter of the present invention has been described according to the first and second embodiments, the present invention is not limited to these and does not contradict the technical idea of the present invention. Needless to say, the present invention can be applied with appropriate changes. For example, in the first and second embodiments, the shaft holes 2a, 23b, and 28a are provided on the brush heads 1 and 20 side, and the support shafts 7a, 11a, 11b, and 27a are provided on the outlet members 7, 10, 27 side. However, the shaft hole may be provided on the outlet member side, and the support shaft may be provided on the brush head side.

  DESCRIPTION OF SYMBOLS 1,20 ... Mowing head, 2a, 5a, 23b, 28a ... Shaft hole, 6, 23a ... Mounting hole, 7, 10, 27 ... Outlet member, 7a, 11a, 11b, 27a ... Support shaft, 7b, 12b, 27b: Lead-out hole, 8, 26 ... Cord (nylon cord), 11 ... First member, 12 ... Second member, 25 ... Reel, 80, 90 ... Operating rod, 81, 91 ... Gearbox.

Claims (3)

In the brush head of the cord type brush cutter that cuts the grass by rotating the flexible cord at high speed,
The brush cutting head is rotatably attached to a gear box attached to the tip of the operation rod,
The cord is led out from an outlet member provided on the outer periphery of the brush head,
The outlet member is provided so as to be rotatable about the axis of a support shaft provided perpendicular to the rotation surface of the brush head,
In the central portion of the outlet member, a lead-out hole through which the cord is led out is provided,
Two support shafts have the same axis and project in opposite directions on the outside of the outlet member in the direction perpendicular to the outlet hole,
An attachment hole to which the outlet member is attached is provided on the outer periphery of the brushing head,
The mounting holes, features and to Turkey over de type Kari払head of the bush cutter that said support shaft has two shaft hole capable journaled provided perpendicularly to the plane of rotation of該刈payment head. The outlet member includes a first member including the support shaft and a second member including the lead-out hole and fitted into the first member.
First member and the The second member, according to claim 1 Symbol placement code type Kari払head of the bush cutter, characterized in that it consists of different materials. The brush cutting head incorporates the cord wound around a reel,
The cutting head of the cord type brush cutter according to claim 1 or 2, wherein a tip portion of the cord is led out from the outlet member.

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