JP6081184B2 - Brush cutter - Google Patents

Description

  The present invention relates to a brush cutter that cuts grass, turf, and the like.

  Patent Document 1 discloses a brush cutter of this type, which includes a support rod, a front end housing fixed to the front end portion of the support rod, and a rotary blade that is rotatably supported by the front end housing. And a controller unit having a rear end housing fixed to the rear end portion of the support rod and a control circuit accommodated in the rear end housing. In this brush cutter, a cover that covers the rear side of the rotary blade is provided at the front end portion of the support rod, and a handle that extends in the left-right direction intersecting the front-rear direction is provided at an intermediate portion in the front-rear direction of the support rod. . When using a brush cutter, hold the grips at the left and right ends of the handle with your left and right hands, and apply the rotating blades of the cutter unit at the front end of the support rod to the grass growing from the ground.

JP 2012-191880 A

  When the brush cutter is not used, the support rod is tilted and placed on a horizontal support surface such as the ground. When the brush cutter is placed on the ground or the like, the cover is grounded at the front end and the rear housing is grounded at the rear end. When the brush cutter is tilted and placed on the ground, the cover has an arc shape so as to cover the rear side of the circular rotary blade, so the front end of the brush cutter is tilted in the horizontal direction by the arc surface of the cover. It was easy and unstable. In addition, since the handle extends in the left-right direction intersecting the longitudinal direction of the support rod, the front end of the brush cutter is tilted so as to roll on the arc surface of the cover until one of the left and right ends of the handle contacts the ground. There was a possibility that the rotary blade of the unit hit and hit a hard ground such as concrete. An object of the present invention is to provide a brush cutter that can be stably placed on a horizontal support surface such as the ground by tilting a support rod.

In order to solve the above-described problems, the present invention provides a support rod extending in the front-rear direction, a front end housing fixed to the front end portion of the support rod, an electric motor accommodated in the front end housing, and a front end housing rotatably supported by the front end housing. A controller unit having a cutter unit having a rotary blade that rotates by driving of the electric motor, a rear end housing fixed to the rear end of the support rod, and a control circuit housed in the rear end housing, It is fixed to the front end or front end housing of the support rod, and a circular arc-shaped cover for covering the rear side of the rotary blade at placing the mounted state on a horizontal support surface to defeat the support rod, the arc The bottom end of the cover is equipped with a cover grounding part that grounds to the support surface, and the rear end housing has a rear end housing grounding part that grounds to the support surface, and both the cover grounding part and the rear end housing grounding part Before and after There is provided a brush cutter, characterized in that it has at least two grounding points apart from each other in the width direction intersecting the direction.

  In the brush cutter configured as described above, both the cover grounding portion and the rear end housing grounding portion have at least two grounding points spaced from each other in the width direction intersecting the front-rear direction. When the support rod is tilted and placed on a horizontal support surface, the brush cutter can be stably placed on the support surface.

  In the brush cutter configured as described above, it is preferable that at least one of the cover grounding portion and the rear-end housing grounding portion has a grounding point continuous in the width direction. It can be placed on a support surface.

  In the brush cutter configured as described above, the rear end housing is likely to fall over when the rear end housing is longer than the length in the width direction in the mounted state. However, since at least two grounding points spaced from each other in the width direction are grounded to the support surface at both ends in the front-rear direction of the support rod, the brush cutter can be stably placed on the support surface. .

  In the brush cutter configured as described above, the power source that drives the cutter unit is attached to the rear portion of the rear end housing and spaced from the support surface in the grounded state of the rear end housing. Even if it is placed on the power supply, the power supply is less likely to get wet. However, the center of gravity of the rear end housing is raised by the power source, so that the rear end housing is easily tilted, but at least two grounding points spaced apart from each other in the width direction at the front and rear ends of the support rod are on the support surface. Since it is grounded, the brush cutter can be stably placed on the support surface.

  In the brush cutter configured as described above, when a handle extending in the width direction or the upward direction is provided at an intermediate portion in the front-rear direction of the support rod, the brush cutter is easily inclined to the support surface. Since at least two grounding points spaced apart from each other in the width direction are grounded to the support surface at both ends in the front-rear direction, the brush cutter can be stably placed on the support surface.

It is a perspective view which shows one Embodiment of the brush cutter of this invention. It is sectional drawing of the front-end part of FIG. It is the perspective view which looked at the front-end part of FIG. 1 from diagonally backward. It is the (a) side view and (b) bottom view of the rear-end part of FIG. It is a side view when the brush cutter of FIG. 1 is mounted on a support surface. FIG. 6 is a rear view of FIG. 5.

  Hereinafter, an embodiment of a brush cutter according to the present invention will be described with reference to the drawings. As shown in FIG. 1, the brush cutter 10 includes a hollow rod-shaped support rod 11 extending in the front-rear direction, a cutter unit 20 at the front end portion of the support rod 11, and a controller unit 30 at the rear end portion of the support rod 11. It has.

  As shown in FIGS. 2 and 3, the cutter unit 20 mainly includes a front end housing 21, an electric motor 22, a speed reduction mechanism 23, and a rotary blade 24. The front end housing 21 is fixed to the front end portion of the support rod 11. An electric motor 22 is accommodated in the front end housing 21, and a rotary blade 24 is rotatably connected to an output shaft 22 a of the electric motor 22 via a speed reduction mechanism 23. The output shaft 22a of the electric motor 22 and the rotating shaft 23a of the speed reduction mechanism 23 are disposed to be inclined about 35 ° forward from the vertical with respect to the support rod 11, and the front end side of the support rod 11 is inclined downward. When held, the rotary blade 24 is parallel to the ground. The rotary blade 24 has a substantially disk shape with a blade portion formed on the periphery thereof, and is detachably fixed to the rotary shaft 23 a of the speed reduction mechanism 23. When the electric motor 22 is driven, the rotary blade 24 is rotated via the speed reduction mechanism 23 by the rotating output shaft 22a.

  As shown in FIG. 4, the controller unit 30 mainly includes a rear end housing 31 and a control circuit (not shown). The rear end housing 31 is fixed to the rear end portion of the support rod 11. As shown in FIGS. 1, 4, and 5, the rear end housing 31 is placed in the front-rear direction in a mounting state in which the support rod 11 is tilted and placed on a horizontal support surface S such as the ground or a work table. The length in the height direction is longer than the length in the width direction orthogonal to each other. In addition, a rear end housing grounding portion 32 is provided at the lower end of the rear portion of the rear end housing 31 to be grounded to the support surface S when the rear end housing 31 is placed. The rear-end housing grounding portion 32 is two ridges extending in the width direction intersecting with the front-rear direction and projecting downward, and when in the mounted state, the two ridges generally support the surface. S is grounded. The rear-end housing grounding portion 32 includes a number of grounding points that are grounded to the support surface S on each protrusion continuously in the width direction intersecting the front-rear direction.

  A battery pack (power source) 33 is detachably attached to the rear portion of the rear end housing 31. The battery pack 33 is mounted apart from the support surface S in the mounted state, so that the battery pack 33 does not get wet even if the support surface S is wet. The battery pack 33 is electrically connected to the electric motor 22 of the cutter unit 20 by a cord (not shown) disposed inside the support rod 11. An operation knob 34 for adjusting the rotational speed of the electric motor 22 of the cutter unit 20 is provided on the front surface of the rear end housing 31.

  As shown in FIG. 3, a cover 40 is provided at the front end of the support rod 11. The cover 40 covers the rear side of the rotary blade 24 of the cutter unit 20 and has an arc shape as a whole. A cover grounding portion 41 that is grounded to the support surface S when placed in the left-right direction central portion of the lower end portion of the cover 40 is provided. The cover grounding portion 41 has a flat shape extending continuously in the width direction intersecting the front-rear direction, and the flat portion is grounded to the support surface S as a whole when in the mounted state. The cover grounding portion 41 includes a number of grounding points that are grounded to the support surface S in this flat portion continuously in the width direction intersecting the front-rear direction.

  A handle 42 is fixed to an intermediate portion of the support rod 11 in the front-rear direction. The handle 42 extends in the width direction intersecting with the front-rear direction, and is curved upward from the intermediate portion. Grips 43, 43 that are gripped by the operator are provided at the left and right ends of the handle 42.

  In the brush cutter 10 configured as described above, the electric motor 22 of the cutter unit 20 is operated by power supply from the battery pack 33, and the rotary blade 24 is rotated by the operation of the electric motor 22. The operator holds both the grips 43 and 43 of the handle 42 with his / her left and right hands and applies the rotary blade 24 of the cutter unit 20 at the front end to the grass and turf growing from the ground, thereby cutting the grass and turf.

  In the brush cutter 10 configured as described above, as shown in FIGS. 5 and 6, when not in use, the support rod 11 is tilted so that the grips 43 and 43 of the handle 42 face obliquely upward. Place. In the state where the support rod 11 is tilted and placed on the horizontal support surface S, the cover grounding portion 41 that contacts the support surface S is provided at the lower end portion of the cover 40, and the support surface S is provided on the rear end housing 31. And a rear end housing grounding portion 32 for grounding. In the brush cutter 10, the cover grounding portion 41 at the front end has a flat shape extending in the width direction intersecting the front-rear direction, and the rear-end housing grounding portion 32 at the rear end extends in the width direction intersecting the front-rear direction. When projecting, the two protrusions of the flat portion of the cover grounding portion 41 at the front end portion and the rear end housing grounding portion 32 of the rear end portion are formed. The support surface S is grounded. Thus, when the support rod 11 is tilted and placed on the horizontal support surface S, the brush cutter 10 is stably placed on the support surface S without tilting to the left and right.

  In the above embodiment, the cover grounding portion 41 has a flat shape extending in the width direction intersecting with the front-rear direction, and the rear end housing grounding portion 32 extends in the width direction intersecting with the front-rear direction and protrudes downward 2. Each of the cover grounding portion 41 and the rear-end housing grounding portion 32 is grounded on the support surface S in the width direction intersecting the front-rear direction. However, the present invention is not limited to this, and the cover grounding portion 41 uses a grounding point using, for example, at least two projecting portions projecting downward at positions separated from each other in the width direction intersecting the front-rear direction. It may be. Similarly, the rear end housing grounding portion 32 may be a grounding point using at least two projecting portions projecting downward, for example, at positions separated from each other in the width direction intersecting the front-rear direction. Even in this case, when the support rod 11 is tilted and placed on the horizontal support surface S, the front and rear cover grounding portions 41 and the rear end housing grounding portion 32 are arranged in the front-rear direction. At least two grounding points provided apart from each other in the width direction intersecting with the grounding surface come into contact with the support surface S. As a result, the brush cutter 10 is grounded on the support surface S by two or more grounding points in the front and rear directions, so that it can be stably placed without tilting and tilting in the left-right width direction. In addition, the rear-end housing grounding portion 32 has two ridges separated from each other in the front-rear direction extending in the width direction intersecting the front-rear direction, but may be one or more ridges. Similarly, at least one of the cover grounding portion 41 and the rear-end housing grounding portion 32 may be a flat ground surface that is grounded to the support surface S when in the mounted state.

  Further, as shown in FIG. 6, in the brush cutter 10 described above, the rear end housing 31 has a length in the height direction longer than the length in the width direction orthogonal to the front-rear direction in the mounted state. ing. When the support rod 11 is tilted and placed on the support surface S, the rear end housing 31 is long and easy to fall down. However, the cover grounding portions 41 and the rear end at both ends in the front-rear direction of the support rod 11 are easy to fall. By the housing grounding portion 32, the brush cutter 10 is stably placed on the support surface S without tilting to the left or right.

  As shown in FIG. 6, in the brush cutter 10, the battery pack 33 that drives the electric motor 22 of the cutter unit 20 is separated from the support surface S in the grounded state at the rear portion of the rear end housing 31. Attached. By separating the battery pack 33 from the support surface S in the mounted state, the battery pack 33 is hardly wetted even when it is mounted on the wet support surface S. However, since the center of gravity of the rear end housing 31 is raised by the battery pack 33, the rear end housing 31 easily falls down to the left and right. The portion 32 allows the brush cutter 10 to be stably placed on the support surface S without tilting and tilting in the left-right width direction.

  As shown in FIG. 6, in the brush cutter 10 described above, a handle 42 extending in the width direction intersecting with the front-rear direction is provided at the middle part of the support rod 11 in the front-rear direction. When the support rod 11 is tilted and placed on the support surface S, the handle 42 extending in the width direction makes it easy to incline in the left and right width directions, but the cover grounding portion 41 and the rear end at both ends in the front-rear direction of the support rod 11 By the housing grounding portion 32, the brush cutter 10 is stably placed on the support surface S without tilting and tilting in the left-right width direction. In the above embodiment, the handle 42 extending in the left-right width direction has been described. However, the present invention is not limited to this, and an oval loop handle extending in the up-down direction and the left-right width direction is used. It may be used.

  In the brush cutter 10 configured as described above, the cover 40 is fixed to the front end portion of the support rod 11, but the present invention is not limited to this, and the cover 40 is not limited to the cutter unit 20, particularly the front end of the cutter unit 20. Even if it is fixed to the housing 21, the same effect can be obtained.

  In the brush cutter 10 configured as described above, the electric motor 22 that rotates the rotary blade 24 is housed in the front end housing 21 of the cutter unit 20. The present invention is not limited to this. A prime mover such as an electric motor or an engine is accommodated in the rear end housing 31, and the drive of the prime mover is attached to the rotary blade 24 of the cutter unit 20 by a drive shaft interposed in the support rod 11. Even if it is made to transmit, the same effect can be obtained.

 DESCRIPTION OF SYMBOLS 10 ... Brush cutter, 11 ... Support rod, 20 ... Cutter unit, 21 ... Front end housing, 24 ... Rotary blade, 30 ... Controller unit, 31 ... Rear end housing, 32 ... Rear end housing grounding part, 33 ... Power supply (battery pack) ), 40 ... cover, 41 ... cover grounding part, 42 ... handle.

Claims (5)

A support rod extending back and forth ,
A front end housing fixed to the front end portion of the support rod; an electric motor housed in the front end housing; and a rotary blade rotatably supported by the front end housing and rotated by driving of the electric motor . A cutter unit;
A controller unit having a rear end housing fixed to a rear end portion of the support rod, and a control circuit accommodated in the rear end housing;
An arc-shaped cover that is fixed to the front end portion of the support rod or the front end housing and covers the rear side of the rotary blade;
In the mounted state in which the support rod is tilted and placed on a horizontal support surface, a cover grounding portion that contacts the support surface is provided at the lower end portion of the arc-shaped cover, and the support is provided on the rear end housing. A rear-end housing grounding portion for grounding to the surface,
The brush cutter according to claim 1, wherein both of the cover grounding portion and the rear housing grounding portion have at least two grounding points spaced apart from each other in the width direction intersecting the front-rear direction. The brush cutter according to claim 1,
The brush cutter according to claim 1, wherein at least one of the cover grounding portion and the rear-end housing grounding portion has the grounding point continuous in the width direction. The brush cutter according to claim 1 or 2,
The brush cutter according to claim 1, wherein the rear end housing has a length in a height direction longer than a length in the width direction in the above-described installation state. The brush cutter according to any one of claims 1 to 3,
A brush cutter, wherein a power source for driving the cutter unit is attached to a rear portion of the rear end housing and spaced from the support surface in a grounded state of the rear end housing. In the brush cutter according to any one of claims 1 to 4,
A brush cutter comprising a handle extending in the width direction or upward direction at an intermediate portion in the front-rear direction of the support rod.

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