Portable implement and attachment of the same

Abstract

To provide an attachment for a brush cutter that can secure posture stability and is excellent in workability.SOLUTION: An attachment 40 for a brush cutter 1 includes: a prime mover 21 of a brush cutting mechanism; a frame 11 in which a brush cutting mechanism and the prime mover are disposed; a first side 211A of the prime mover 21 facing the frame 11; a first hand-held area 11B or a handle 13 disposed so as to face the first side 211A; and a second side 211B of the prime mover 21 on a side opposite to the first side 211A facing the first hand-held area 11B or the handle 13. The attachment includes a second hand-held area or a grip 43 detachably attached to the brush cutter, and is configured so that the second hand-held area or the grip 43 faces the second side 211B when the attachment is attached to the brush cutter.SELECTED DRAWING: Figure 18

Description

[Technical Field]

[0001] The present invention relates to a portable working machine with excellent workability. [Background technology]

[0002] Conventionally, mowing is performed by an operator moving the brush cutter mechanism along the ground while maintaining a good balance with both hands. These brush cutters are mainly divided into two types based on the shape of the handle: U-handle and loop-handle. The U-handle type is easy to hold because the brush cutter is hung from a shoulder strap and both hands are extended toward the handle, making it particularly suitable for mowing on flat ground. The loop-handle type is held with one hand extended forward, making it easy to tilt the brush cutter upward, making it ideal for mowing on slopes.

[0003] However, with conventional brush cutters, when the grass is cut in front of the body, whether it is a loop-handle type or a U-handle type, the engine part, including both hands, is located behind the body. Therefore, even if the balance is well-maintained, the posture stability during operation is not necessarily excellent due to the engine's moment of inertia, and the body is prone to shaking.

[0004] Furthermore, when using a U-handle type to mow a slope, the user has to lift the brush cutter with both hands, which significantly reduces posture stability. Hedge trimmers, which are used in the same way as brush cutters, have the problem of requiring arm strength to maintain the position of the hedge trimmer due to the moment of inertia of the motor, which has the axis of rotation at the center of the frame's extension. Furthermore, air blowers, such as those used to collect cut grass, have the same problems as conventional brush cutters, especially in large models. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Jitsuzen Showa 62-89918 [Patent Document 2] Patent Publication No. 2013-126406 [Patent Document 3] Patent Publication No. 2013-227918 Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made in view of the above, and provides a portable working machine that ensures posture stability and is excellent in workability. [Means for solving the problem]

[0007] The brush cutter attachment described in claim 1 is an attachment for a brush cutter comprising a prime mover for a brush cutter mechanism, a frame in which the brush cutter mechanism and the prime mover are arranged, a first side of the prime mover facing the frame, a first holding area or handle arranged to face the first side, and a second side of the prime mover opposite the first side facing the first holding area or handle, and is characterized in that it comprises a second holding area or grip that can be detachably attached to the brush cutter, and when attached to the brush cutter, the second holding area or grip is arranged to face the second side.

[0008] That is, in the invention of claim 1, one handle is on the first side of the motor and the other handle is on the second side of the motor opposite the first side, so the motor is positioned closer to the operator. This reduces the effect of the moment of inertia around the body axis, preventing the rotary blade from shifting position due to swinging during handling, improving workability when mowing on flat ground.

[0009] The attachment described in claim 2 is characterized in that, compared to the attachment described in claim 1, the grip is positioned in a virtual space sandwiched between a first virtual horizontal plane that is in contact with the bottom surface of the prime mover and is parallel to the extension direction of the frame towards the brush cutting mechanism, and a second virtual horizontal plane that is in contact with the top surface of the prime mover and is parallel to the extension direction of the frame towards the brush cutting mechanism.

[0010] In other words, the invention of claim 2 positions the grip of the attachment on the second side in a virtual space that is above a virtual horizontal plane that contacts the bottom surface of the prime mover and below a virtual horizontal plane that contacts the top surface of the prime mover, thereby reducing the moment of inertia relative to the prime mover, with the center of the extension direction of the frame in which the brush cutting mechanism is located as the axis of rotation, and making it possible to cut grass on slopes at a larger angle of attack, achieving the same effect as on flat ground.

[0011] The attachment described in claim 4 is characterized in that at least a part of the second handle region or the grip is disposed in an imaginary horizontal plane that is parallel to the extending direction of the frame and passes through the center of gravity of the prime mover.

[0012] In other words, the invention of claim 4 balances the center of gravity of the motor with the handle on the second side, eliminating the need for excessive holding force, and suppresses the generation of moment of inertia caused by the motor with the center of the extension direction of the frame as the rotation axis, thereby suppressing fluctuations in the cutting angle caused by the rotary blade, thereby ensuring even greater operational stability. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide an attachment that ensures posture stability and has excellent workability. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a three-dimensional view of a brush cutter according to the present invention; [Figure 2] The configuration around the prime mover in Figure 1 is shown in three views (front view, side view, and plan view) using third angle projection. [Figure 3] FIG. 10 is a three-dimensional view of a brush cutter according to another embodiment of the present invention. [Figure 4] The configuration around the prime mover in Figure 3 is shown in three views (front view, side view, and plan view) using third angle projection. [Figure 5] FIG. 10 is a three-dimensional view of a brush cutter according to another embodiment of the present invention. [Figure 6] The configuration around the prime mover in Figure 5 is shown in three views (front view, side view, and plan view) using the third angle projection method. [Figure 7] FIG. 10 is a three-dimensional view of a brush cutter according to another embodiment of the present invention. [Figure 8] The configuration around the prime mover in Figure 7 is shown in three views (front view, side view, and plan view) using third angle projection. [Figure 9] FIG. 10 is a three-dimensional view of a brush cutter according to another embodiment of the present invention. [Figure 10] The configuration in the vicinity of the prime mover in Figure 9 is shown in three views (front view, side view, and plan view) using the third angle projection method. [Figure 11] FIG. 10 is a three-dimensional view of a brush cutter according to another embodiment of the present invention. [Figure 12] The configuration in the vicinity of the prime mover in Figure 11 is shown in three views (front view, side view, and plan view) using the third angle projection method. [Figure 13] FIG. 10 is a three-dimensional view of a brush cutter according to another embodiment of the present invention. [Figure 14] The configuration in the vicinity of the prime mover in Figure 13 is shown in three views (front view, side view, and plan view) using the third angle projection method. [Figure 15] FIG. 3 is a plan view of the motor portion of the brush cutter in FIG. 2. [Figure 16] 1A and 1B are diagrams showing the state in which a conventional brush cutter is held, in which FIG. 1A is a front view when in use, FIG. 1B is a plan view when in use, and FIG. 1C is a front view and a side view when in standby mode. [Figure 17] 1A and 1B are diagrams showing how the brush cutter of the present invention is held, in which FIG. 1A is a front view when in use, FIG. 1B is a plan view when in use, and FIG. 1C is a front view and a side view when in standby mode. [Figure 18]1 is an external configuration diagram of a brush cutter to which an attachment according to the present invention is attached; [Figure 19] 1A is a plan view, FIG. 1B is a side view, and FIG. 1C is a cross-sectional view taken along line AA of the attachment of the present invention. In FIG. 1A and FIG. 1B, the positional relationship between the motor unit 20 and the first frame unit 11A is conceptually depicted by dotted lines. [Figure 20] 1 is a three-dimensional view of a blower according to the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Fig. 1 is a three-dimensional view of a brush cutter according to the present invention. Fig. 2 is a three-view diagram ((a) is a front view, (b) is a plan view, (c) is a right side view, and (d) is a left side view) showing the configuration around the prime mover in Fig. 1 using third angle projection, and is a supplement to Fig. 1. Note that the same reference numerals are used for components common to Fig. 1 and Fig. 2, and the same applies to Figs. 3 to 20 described below.

[0016] The brush cutter 1 is composed of a frame portion 10 (hereinafter referred to as the first frame portion 10) having a first handle area, a motor portion 20, and a frame portion 30 (hereinafter referred to as the second frame portion 30) having a second handle area.

[0017] The first frame unit 10 is a longitudinal cylindrical first frame 11. One end 11A of the first frame 11 is equipped with a disk-shaped rotary blade 12, which serves as the brush-cutting mechanism. A shaft (not shown) that rotates the rotary blade 12 is inserted through the first frame 11. The first frame 11 is not limited to a cylindrical body, but is selected taking into consideration strength, weight, and other factors. A splash guard cover 121 is also provided adjacent to the rotary blade 12. A first handle region 11B is provided in the middle region of the first frame 11. A motor unit 20 is disposed at the other end 11C of the first frame 11, facing the first handle region 11B. One end 31A of a second frame 31, which will be described later, is also integrally provided at the other end 11C of the first frame 11.

[0018] The first gripping region 11B is also provided with a loop handle 13. The first gripping region 11B may be provided with a U-shaped handle, or the first gripping region 11B may be held by hand without using either handle. That is, the first gripping region 11B alone may be provided without a separate handle. In this case, the first gripping region 11B is the portion of the first frame 11 that can be held by hand. When a U-shaped handle is provided, the loop handle may be attached separately and detachably later, resulting in a brush cutter with both handles. The loop handle 13, U-shaped handle, and other attachments to the first gripping region 11B are not components of the first gripping region 11B, but are support elements that make it easier to hold the first gripping region 11B in the hand.

[0019] The motor section 20 is composed of a motor 21, a fuel tank 22, and a clutch case 23. The motor 21 includes a motor body, a motor cover, an air cleaner, a starting grip, and other components, but these are similar to those of a typical brush cutter and will not be described here. The motor 21 has a first side 211A facing the first handle region 11B and a second side 211B opposite the first side 211A. The outline of the motor 21 is not limited to flat surfaces; it also includes many gently curved surfaces, and many of the joints between the surfaces are rounded. The two sides 211A and 211B do not necessarily mean that they are flat and parallel to each other; they include sides that are roughly opposite each other. However, because the first side 211A facing the first handle region 11B is unclear, the scope of the first side 211A is defined using Figure 15.

[0020] 15 is an excerpt from the plan view of FIG. 2 and shows first side plane 211Aa, which is a plane that contacts one end of first side surface 211A of motor 21 and extends in a direction perpendicular to the paper, and first side plane 211Ab, which is a plane that contacts the other end of first side surface 211A of motor 21. Reference plane 211X is a plane perpendicular to the paper and includes a straight line α (here, for example, the center line in the extension direction of the first frame 11) that coincides with the extension direction of first frame 11. Note that when first side plane 211Aa is not perpendicular to the paper, reference plane 211X is a plane that perpendicularly intersects with imaginary plane β (not shown), which perpendicularly intersects first side plane 211Aa, and includes the straight line α. Here, the range of the first side surface 211A is the range from the first side plane 211Aa to the first side plane 211Ab. More specifically, the angle θ11 from the reference plane 211X to the first side plane 211Aa is 135°, and similarly, the angle θ12 from the reference plane 211X to the first side plane 211Ab is 135°. However, when the range of the first side surface 211A is expressed as θ11 and θ12, each is a side surface in the range from 90° to 135°.

[0021] 15 also shows second side plane 211Ba, which is a plane that contacts one end of second side plane 211B of motor 21 and extends in a direction perpendicular to the paper surface, and second side plane 211Bb, which is a plane that contacts the other end of second side plane 211B. Here, the range of second side plane 211B is the range from second side plane 211Ba to second side plane 211Bb. More specifically, angle θ21 from reference plane 211X to second side plane 211Ba is 45°, and similarly, angle θ22 from reference plane 211X to second side plane 211Bb is 45°. However, when the range of second side plane 211B is expressed by θ21 and θ22, they each range from 45° to 90°. Here, the case where second side plane 211Ba is not perpendicular to the paper surface is also as described above. Furthermore, the same applies to side surfaces other than the first and second side surfaces, and the ranges of the top and bottom surfaces are limited to the side surfaces that form the boundaries between them, so explanations will be omitted. Here, with regard to side surfaces other than the first and second side surfaces, a side surface that is in contact with the first side surface 211Aa of the first side surface and in contact with the second side surface 211Ba of the second side surface will be referred to as a third side surface, and a side surface that is in contact with the first side surface 211Ab of the first side surface and in contact with the second side surface 211Bb on the opposite side of the third side surface will be referred to as a fourth side surface.

[0022] 1 and 2, the fuel tank 22 is a gasoline tank, and is usually located below the motor 21 when the brush cutter 1 is placed normally on a horizontal surface on the ground. The bottom of the prime mover 21 faces a horizontal plane. Here, the bottom of the prime mover 21 refers to the surface that is designed to be the bottom from the standpoint of the functional characteristics and safety of the prime mover 21. The up and down directions are written based on the brush cutter 1 being placed normally on a horizontal surface, so the bottom in this case refers to the bottom side of the prime mover 21. To make it easier to check the amount of gasoline remaining, the fuel tank 22 is made of a white, translucent resin tank. The prime mover 21 is not limited to a gasoline-fueled engine, and may be an electric motor.

[0023] The clutch case 23 serves to connect the prime mover 21 to a shaft (not shown), and power from the prime mover 21 is transmitted to the shaft via the clutch case 23.

[0024] The second frame section 30 is composed of a second frame 31 and a grip 32. The second frame 31 extends from the other end 11C of the first frame 11 so as to pass under the bottom surface of the motor section 20, and one end 31A of the second frame 31 is integrally formed with the first frame 11. The second frame 31 can be formed integrally with or fixed to the first frame section 10, or it can have a detachable structure. A second grip region 31B is provided at the other end 31C of the second frame 31, and a grip 32 is disposed on the surface of the second grip region 31B. The grip 32 is not limited to being disposed on the surface of the second grip region 31B, but can also be disposed so as to protrude from the first frame 11. Such an arrangement is also effective for the grip, which will be described later.

[0025] In this embodiment, second frame 31 does not contact motor unit 20, and second handle region 31B and grip 32 are located on the opposite side of first frame 11 across motor 21. Explaining in more detail, second frame 31 is shaped like a one-legged sled and holds motor unit 20 from above, and grip 32 is positioned to face second side 211B, which is opposite first side 211A of motor 21 that faces first handle region 11B. Here, it is desirable that at least a portion of each of the first gripping region 11B or handle 13 and the second gripping region 31B or grip 32 be arranged on an imaginary horizontal plane parallel to the extension direction of the first frame. Ideally, it is desirable that each be arranged so that an imaginary line connecting the first gripping region 11B or handle 13 and the second gripping region 31B or grip 32 passes through the center of gravity of the prime mover 21. To avoid heat from the prime mover 21, the grip 32 and the prime mover 21 are spaced about 10 cm apart. In addition, the second gripping region 31B, located at the other end 31C of the second frame 31, is equipped with a throttle for adjusting the rotation speed of the rotary blade 12 and a start switch for the prime mover 21, but these are not shown in the drawings.

[0026] The grip 32 in the second handle region 31B forms a handle and is located at the other end 31C of the second frame 31. In this embodiment, the grip 32 is approximately 15 cm long and made of resin. It has multiple grooves 321 cut in the circumferential direction to improve grip. To improve grip, the grip 32 may be formed as a flattened cylinder, i.e., an elliptical cylinder. The grip 32 is not essential; the second frame 31 can be used as a substitute. Therefore, the grip 32 is appropriately installed in consideration of the ease of handling of the brush cutter 1. In this case, the second handle region 31B becomes a portion of the second frame 31 that can be held by hand. The grip 32 and other attachments attached to the second handle region 31B are not components of the second handle region 31B, but rather support elements that facilitate holding the second handle region 31B.

[0027] With the brush cutter 1 configured as described above, the user holds the loop handle 13 with one hand and the grip 32 with the other to cut grass. While conventional brush cutters have the motor unit 20 located at the end of the overall structure, making the rotary blade 12 prone to shaking during operation, the brush cutter of the present invention is located between the hands, suppressing this, improving workability. Especially when cutting grass on slopes, the brush cutter is easier to operate than conventional loop handle types. Furthermore, the second frame 31 extends beneath the motor unit 20, providing excellent stability when placed on the ground and also serving as a protective cover for the plastic fuel tank 22.

[0028] The effects of the present invention will be explained in detail using Figures 16 and 17. Figure 16 is a diagram showing how a conventional brush cutter is held, with Figure 16(a) being a front view when in use, Figure 16(b) being a plan view when in use, and Figure 16(c) being a front view (left side in the figure) and a side view (right side in the figure) when in standby. Figure 17 is a diagram showing how the brush cutter of the present invention is held, with Figure 17(a) being a front view when in use, Figure 17(b) being a plan view when in use, and Figure 17(c) being a front view (left side in the figure) and a side view (right side in the figure) when in standby. For convenience of explanation, the motor in the conventional brush cutter is located above the first frame. It is also assumed that the distance X from the body axis to the rotary blade is the same between the conventional brush cutter and the brush cutter of the present invention.

[0029] As shown in Figures 16(a) and 17(a), a worker 50 who is mowing grass holds the first frame 11 (including the second frame 31 in Figure 17(a)) with his hands (51A, 51B), tilts his head 51 forward so that the rotary blade 12 reaches the ground, and moves the rotary blade 12 from side to side to remove grass from the ground. This operation involves rotating the frame 11 (including the second frame 31 in Figure 17(b)) horizontally around the body axis, as shown in Figures 16(b) and 17(b). Here, the body axis is approximately the straight line connecting the head and waist when the worker is in a forward-leaning position. In conventional brush cutters, the motor 21, which is generally heavier than the rotary blade 12, is located at the other end of the frame 11, farther from the body axis, to perform rotational tasks. This means that a larger moment of inertia is more likely to act, which can lead to hand shake when the user tries to accurately move the rotary blade 12 to the desired grass position while maintaining a forward-leaning posture.

[0030] This problem arises because the moment of inertia of a rotating prime mover is proportional to its mass and radius of rotation, and so when equipped with a prime mover of the same weight, the radius of rotation R1, which corresponds to the distance from the body axis to the prime mover, is large. Therefore, in the present invention, a second handle area or grip is provided to reduce the radius of rotation r, thereby bringing the prime mover closer to the body axis.

[0031] Furthermore, the aforementioned moment of inertia cannot be overlooked as varying the cutting angle, which is the angle of the rotary blade 12 with respect to the horizontal plane. This is because, as shown in Figure 16(c), when the prime mover 21 is disposed above the first frame 11, a distance R2 corresponding to the radius of rotation is generated between the first frame 11 and the prime mover 21, and the action of the moment of inertia causes the prime mover 21 to rotate around the center of the extension direction of the first frame 11 as a starting point. However, as shown in Figure 17(c), the first holding area or handle and the second holding area or grip in the present invention can be positioned to face the side of the prime mover 21 across from each other, while being positioned so that the distance between the first frame 11 and the prime mover 21 can be shortened, thereby reducing the influence of the respective moments of inertia.

[0032] Figure 3 is a three-dimensional view of a brush cutter according to another embodiment of the present invention. Figure 4 is a three-view diagram ((a) is a front view, (b) is a plan view, (c) is a right side view, and (d) is a left side view) showing the configuration around the prime mover in Figure 3 using third angle projection, and is a supplement to Figure 3. Here, the only difference from Figures 1 and 2 is a part of the second frame portion 30, so the details of that will be explained.

[0033] The second frame section 30 is composed of a second frame 31a and a grip 32a. The second frame 31a extends from the other end 11C of the first frame 11 so as to pass under the bottom of the motor section 20, and one end 31aA of the second frame 31a is integrally formed with the first frame 11. The second frame 31a can be formed integrally with or fixed to the first frame section 10, or it can have a detachable structure. A second handle region 31aB is provided at the other end 31aC of the second frame 31a, and a grip 32a is arranged so as to contact the second handle region 31aB. The grip 32a, which is in contact with the second handle region 31aB, is a cylindrical body that forms a handle and is arranged so as to be perpendicular to the second frame 31a.

[0034] With this arrangement, when the second frame 31a is held between the fingers of the gripping hand and the palm of the hand is placed on the grip 32a, the motor 21 can be easily moved closer to the body axis, making it possible to operate the brush cutter 1 more stably than with the structure shown in Figure 1. Furthermore, the grip 32a contacts the second gripping region 31aB at its approximate center and is also approximately parallel to the second side surface 211B, so it can be used equally by both right-handed and left-handed users. However, the arrangement of the grip 32a is not limited to the above and can be determined taking into consideration the convenience of the dominant hand. For example, the contact with the second gripping region 31aB does not have to be at the center, and it does not have to be parallel to the second side surface 211B.

[0035] Figure 5 is a three-dimensional view of a brush cutter according to another embodiment of the present invention. Figure 6 is a three-view diagram ((a) is a front view, (b) is a plan view, (c) is a right side view, and (d) is a left side view) showing the configuration around the prime mover in Figure 5 using third angle projection, and is a supplement to Figure 5. The only difference from Figures 1 and 2 is a part of the second frame portion 30, so the details of that will be explained here.

[0036] The second frame section 30 is composed of a second frame 31b and a grip 32b. The second frame 31b extends from the other end 11C of the first frame 11 so as to pass under the bottom surface of the motor section 20, and one end 31bA of the second frame 31b is integral with the first frame 11. The second frame 31b can be integrally formed with or fixed to the first frame section 11, or it can be detachable. A second handle region 31bB is provided at the other end 31bC of the second frame 31b, and a grip 32b is disposed in contact with the second handle region 31bB. The grip 32b connected to the second handle region 31bB is a cylindrical member forming a handle and is disposed perpendicular to the second frame 31b. At least one end 32bA and the other end 32bB of the grip 32b extend to the lowest surface of the second frame 31b when the brush cutter 1 is placed normally on a horizontal surface.

[0037] When this brush cutter 1 is placed normally on a horizontal surface, at least one of the ends 32bA and 32bB of the grip 32b touches the ground together with the second frame 31b, allowing the brush cutter 1 to be placed without the prime mover 21 touching the ground. This arrangement maintains the effect of the structure of the grip 32a shown in Fig. 3 while preventing the surface of the prime mover 20 from becoming soiled, thereby maintaining the performance of the prime mover 21 without reducing the cooling efficiency of the prime mover 21. Furthermore, by touching the end 32bA and / or the other end 32bB of the grip 32b to the horizontal surface, the brush cutter 1 can be placed stably with the rotary blade 12 facing upward, thereby reducing the horizontal storage area required.

[0038] Figure 7 is a three-dimensional view of a brush cutter according to another embodiment of the present invention. Figure 8 is a three-view diagram ((a) is a front view, (b) is a plan view, (c) is a right side view, and (d) is a left side view) showing the configuration around the prime mover in Figure 7 using third angle projection, and is a supplement to Figure 7. The only difference from Figures 1 and 2 is a part of the second frame portion 30, so the details of that will be explained here.

[0039] The second frame section 30 is composed of a second frame 31c and a grip 32. The second frame 31c extends from the motor section 20, and one end 31cA of the second frame 31c is disposed on and integrated with the second side surface 211B of the motor 21. The second frame 31c can be formed integrally with or fixed to the second side surface 211B, or can have a detachable structure. A second handle region 31cB is provided at the other end 31cC of the second frame 31c, and the grip 32 is disposed to cover the surface of the second handle region 31cB.

[0040] By adopting such an arrangement, the placement of the second frame below the motor 21 can be avoided, making it possible to make the external dimensions of the brush cutter 1 even more compact than the structure shown in Figure 1, etc., thereby reducing transportation costs.

[0041] Figure 9 is a three-dimensional view of a brush cutter according to another embodiment of the present invention. Figure 10 is a three-view diagram ((a) is a front view, (b) is a plan view, (c) is a right side view, and (d) is a left side view) showing the configuration around the prime mover in Figure 9 using third angle projection, and is a supplement to Figure 9. The only difference from Figures 1 and 2 is a part of the second frame portion 30, so the details of that will be explained here.

[0042] Second frame section 30 is composed of second frame 31d and grip 32. Second frame 31d extends from both ends of first frame 11 so as to pass under the bottom surface of motor section 20, and one end 31dA of second frame 31d is formed integrally with first frame 11. Second frame 31d can be formed integrally with or fixed to first frame section 10, or can have a detachable structure. A second handle region 31dB is provided at the other end 31dC of second frame 31d, and grip 32 is arranged on the surface of second handle region 31dB.

[0043] With one end 31dA of second frame 31d disposed between both ends of first frame 11, second frame 31d extends from one end 31dA through the underside of prime mover 21, and the other end 31dC is disposed in a position facing second side surface 211B of prime mover 21. Note that in FIG. 9, one end 31dA is disposed between loop handle 13 and other end 11C of first frame 11, but this is not limited thereto, and it may be disposed between loop handle 13 and one end 11A of first frame 11. Note that grip 32 can be changed to either grip 32a shown in FIG. 3 or grip 32b shown in FIG. 5. By adopting such an arrangement, the joint between the first frame 11 and the second frame 31d can be made at a more acute angle than the arrangement shown in Figure 1, etc., while maintaining the functionality shown in Figure 1, etc. Therefore, the joint strength is improved by increasing the joint area, and the degree of freedom in the joint location is also increased, making it possible to adopt a variety of arrangement configurations while maintaining the functionality shown in Figure 1, etc.

[0044] Figure 11 is a three-dimensional view of a brush cutter according to another embodiment of the present invention. Figure 12 is a three-view diagram ((a) is a front view, (b) is a plan view, (c) is a right side view, and (d) is a left side view) showing the configuration around the prime mover in Figure 11 using third angle projection, and is a supplement to Figure 11. The only difference from Figure 9 is the second frame portion 30, so the details of this will be explained below.

[0045] Second frame section 30 is composed of second frame 31d, second frame 33, and grip 32c. Second frame 31d extends from both ends of first frame 11 so as to pass under the bottom of motor section 20, and one end 31dA of second frame 31d is formed integrally with first frame 11. Second frame 31d can be formed integrally with or fixed to first frame section 11, or it can have a detachable structure. A second handle region 31dB is provided at the other end 31dC of second frame 31d, and grip 32c is arranged so as to contact second handle region 31dB.

[0046] One end 33A of second frame 33 is disposed between both ends of first frame 11, extends from end 33A along the side of motor unit 20, and the other end 33C is disposed in a position facing second side surface 211B of motor 21. Grip 32c of second handle region 33B at other end 33C of second frame 33 is disposed perpendicular to the extension direction of second frame 31d and is disposed on the surface of other end 33C of second frame 33. Note that, in FIG. 11 , one end 33A is disposed between loop handle 13 and other end 11C of first frame 11, but this is not limited thereto and it may be disposed between loop handle 13 and one end 11A of first frame 11. Furthermore, one end 33A is positioned at the same position as one end 31dA of second frame 31d, but this is not limited thereto and it may be disposed at any location on first frame 11. By adopting such an arrangement, the functions shown in FIG. 9 are maintained while the second frame 33 prevents contact between the human body and the motor unit 20, thereby preventing burns to the human body due to heat generated by the motor 21.

[0047] Figure 13 is a three-dimensional view of a brush cutter according to another embodiment of the present invention. Figure 14 is a three-view diagram ((a) is a front view, (b) is a plan view, (c) is a right side view, and (d) is a left side view) showing the configuration around the prime mover in Figure 13 using third angle projection, and is a supplement to Figure 13. The only differences from Figure 11 are the second frame 31e, the second frame 33a, and the grip 32d in the second frame portion 30, and so the details of these differences will be explained below.

[0048] One end 33aA of second frame 33a and one end 31eA of second frame 31e are disposed between both ends of first frame 11, and second frame 33a extends from one end 33aA through the bottom of motor section 20, with the other end 33aC disposed in a position facing second side surface 211B of motor 21. Here, second frame 31e extends substantially parallel to second frame 33a, but this is not limitative, and the gap between second frame 31e and second frame 33a may be gradually narrowed or, conversely, widened. A second handle region 31eB is provided at the other end 31eC of the second frame 31e, and a second handle region 33aB is provided at the other end 33aC of the second frame 33a. Here, the grips 32d near the second handle regions 31eB and 33aB are arranged so as to be perpendicular to the extension directions of the second frames 31e and 33a. With this arrangement, when the brush cutter is placed normally on a horizontal surface, both second frames 31e and 33a are in contact with the ground, making it possible to place the brush cutter more stably than with the arrangement shown in Figure 3.

[0049] Fig. 18 is a three-dimensional view of a brush cutter to which an attachment according to the present invention is attached. Fig. 19 shows the attachment of the present invention, with Fig. 19a being a plan view, Fig. 19b being a side view, and Fig. 19c being a cross-sectional view taken along the line AA. In Fig. 19a and Fig. 19b, the positional relationship between the first frame 10 and the motor 20 is also conceptually depicted by dotted lines. In this embodiment, the second frames 31e and 33a and the grip 32d in Fig. 13 are used as an attachment, and the details thereof will be described below.

[0050] The attachment 40 is composed of a joint 41, two identical arch-shaped plates 42a and 42b, and a grip 43. The joint 41 has a structure in which a square pillar is split in half, with semi-cylindrical grooves 411 provided in each half, and the two halves join together to combine with the first frame 11. They are joined together with bolts 412. However, this is not limited to this, and the attachment may also be easily detachable (separable into two) with a rotating lever.

[0051] The two plate materials 42a and 42b are approximately 8 mm thick and 4 cm wide, and are arranged parallel to the extension direction of the first frame 11 so as to pass through the motor unit 20. One end 42aA and 42bA of each plate is fixed to the joint 41, and the other ends 42aC and 42bC form second handle regions 42aB and 42bB and are fixed to the cross section of the grip 43. The grip 43 has a plurality of grooves 431. Plate members 42a and 42b can be made lightweight by being two plates or rods of the same shape. In addition, because they are the same shape and pass through motor section 20, they are symmetrical in the extension direction of first frame 11, improving ground contact. Joint 41 may in no way be configured to be detachably attached to first frame section 10.

[0052] In this embodiment, plates 42a and 42b do not contact fuel tank 22, and second grip regions 42aB and 42bB are located on the extension of first frame 11 on second side surface 211B side of motor 21. Depending on the specification, they may be positioned above or below this. To avoid heat from motor 21, grip 43 and motor 21 are spaced about 10 cm apart.

[0053] The attachment 40 is shaped like a bottomless sled, supporting the motor unit 20 on top. Each component is spaced apart from the motor unit 20 and is attached to the first frame 11 in a manner designed to ensure strength without flexing. The attachment 40 is designed to be detachably attached to an existing brush cutter 1, and is offered not only as a set product with the brush cutter 1, but also as a standalone product. As long as the joint 41 can be suitably attached to the first frame 11, the brush cutter 1 may have either a loop handle or a U-handle. The two plates 42a and 42b may be configured as two rods rather than plates, and a ladder-like joint may be provided in the middle to provide strength. Alternatively, the bottom of the sled may be a single curved plate with a grip 43 attached to its end. However, the plate should have a recess or hole to allow the grip 43 to be gripped by hand.

[0054] In the case of a loop handle type, the joint 41 is attached so as not to interfere with the throttle or engine switch that is normally located on the first frame portion 10. Note that in cases where the throttle or engine switch is unitized and attached to the first frame portion 10 by a cable extending from the engine 21, this may be removed as appropriate and reattached near the grip 43, and the joint 41 may be attached on top of the existing first grip area.

[0055] In the case of a U-shaped handle type, a detachable loop handle or an upward-facing cylindrical handle that is perpendicular to the first frame 11 may be attached separately near the U-shaped handle as appropriate. In the case of a U-shaped handle type, if the throttle and motor switch are unitized and attached to the U-shaped handle by a cable extending from the motor 21, this may be removed and attached near the grip 43 as appropriate.

[0056] Figure 20 is a three-dimensional view of a blower according to the present invention. However, since the blower according to the present invention is the same as the brush cutter described above, except that the prime mover is replaced with an air compressor and the rotary blades constituting the brush cutting mechanism are replaced with air outlets, explanations of matters that can be understood by making these substitutions in the brush cutter embodiments described above will be omitted. Also, since Figure 20 is based on Figure 1, explanations of the blower will focus on differences from the brush cutter in Figure 1. Note that explanations of components with the same names as those in the brush cutter will be omitted, as their functions and effects are the same.

[0057] The blower 6 is composed of a frame portion 60 (hereinafter referred to as the first frame portion 60) having a first handle area, an air compression portion 70, and a frame portion 80 (hereinafter referred to as the second frame portion 80) having a second handle area.

[0058] The first frame portion 60 has an air outlet 62 at one end 61A of the first frame 61, and the inside of the first frame 61 is connected so that air can flow from the other end 61C of the first frame 61 to the air outlet 62 (not shown). A first handle region 61B is provided in the middle region of the first frame 61. An air compressor 70 is disposed at the other end 61C of the first frame 61 facing the first handle region 61B, and one end 81A of a second frame 81 (described later) is integrally provided at the other end 61C of the first frame 61. A loop handle 13 is provided in the first handle region 61B.

[0059] Air compression unit 70 is composed of air compressor 71 and connection joint 72. Air compressor 71 also includes components other than the air compressor body, but these are similar to those of a typical air compressor and will not be described here. Air compressor 71 has a first side surface 711A facing first handle region 61B and a second side surface 711B opposite first side surface 711A.

[0060] The second frame portion 80 is composed of a second frame 81 and a grip 32. The second frame 81 extends from the other end 61C of the first frame 61 so as to pass under the bottom surface of the air compressor 70, and one end 81A of the second frame 81 is formed integrally with the first frame 61. A second handle region 81B is provided at the other end 81C of the second frame 81, and a grip 32 is disposed on the surface of the second handle region 81B.

[0061] With the blower 6 having the above configuration, the operator can collect grass after cutting by grasping the loop handle 13 with one hand and the grip 32 with the other. In conventional blowers, the air compression unit 20 is located at the end of the overall configuration, and the loop handle 13 or the grip 32 is held with only one hand, which makes the air outlet 62 prone to shaking during operation. In the present invention, however, the air outlet 62 is located between the two hands, preventing this, improving workability, especially in large machines. [Industrial Applicability]

[0062] According to the present invention, it is possible to provide a portable working machine that ensures posture stability and is excellent in workability. [Explanation of symbols]

[0063] 1 brush cutter 10, 60 First frame section 11, 61 1st frame 11B, 61B 1st handle area 12 Rotary blade 13 Loop Handle 20 Engine Section 21 Prime Mover 211A, 711A 1st side 211B, 711B 2nd side 22 Fuel tank 23 Clutch case 30, 80 Second frame section 31, 81 2nd frame 31B, 81B 2nd handle area 32 Grip 40 Attachments 41 Joint 411 Groove 412 volts 42a, 42b plate material 42aB, 42bB 2nd handle area 43 Grip 62 Ventilation outlet 70 Air Compressor 71 Air Compressor

Claims

1. A brush cutter attachment comprising: a motor for a brush cutting mechanism; a frame on which the brush cutting mechanism and the motor are disposed; a first side surface of the motor facing the frame; a first gripping area or handle disposed so as to face the first side surface; and a second side surface of the motor opposite the first side surface facing the first gripping area or handle, a second handle area or grip removably attached to the brush cutter; and wherein when attached to the brush cutter, the second handle area or grip is configured to face the second side surface.

2. a first imaginary horizontal plane that is in contact with a bottom surface of the motor and is parallel to a direction in which the frame extends toward the brush cutting mechanism; a second imaginary horizontal plane that is in contact with an upper surface of the prime mover and is parallel to the direction in which the frame extends toward the brush cutting mechanism; 2. The brush cutter attachment according to claim 1, wherein the grip is arranged in a virtual space defined by the arrows.

3. a third side of the prime mover adjacent to each of the first and second sides; a fourth side of the motor opposite the third side; and Equipped with a first imaginary plane that is in contact with a third side surface of the motor and is parallel to a direction in which the frame extends toward the brush cutting mechanism; a second imaginary plane that is in contact with a fourth side surface of the motor and is parallel to the first imaginary plane; 3. The brush cutter attachment according to claim 1, wherein the grip is arranged in a virtual space defined by the arrows.

4. 2. The brush cutter attachment according to claim 1, wherein at least a portion of the second handle area or grip is configured to be positioned within an imaginary horizontal plane that is parallel to the extension direction of the frame and passes through the center of gravity of the prime mover.

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