JPS63177733A - Portable reaper - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a portable brush cutter.

(Prior Art) In a portable brush cutter, a transmission case is provided at the tip of the brush cutter body, and a cutting blade body that rotates around a vertical axis 6 is provided below the transmission case. A device in which a dish-shaped grounding body is provided at the lower center of the ground is well known, such as in Japanese Utility Model Publication No. 39-35976.

(Problem to be Solved by the Invention) This type of brush cutter has a rotating cutting blade body that rotates while swinging the cutting blade side from side to side with the band of the brush cutter body hung on the shoulder of the operator. Weeds and the like are harvested by this method. However, in the past, a grounding body was only provided at the lower center of the cutting blade, so the worker had to support the weight of the metal body after mowing so that the grounding body was close to or in sliding contact with the ground during work. It has to be balanced and is therefore very difficult to use.
In addition, the fatigue level was extremely high during long hours of work.

SUMMARY OF THE INVENTION In view of these conventional problems, it is an object of the present invention to enable an operator to work efficiently without having to support the weight of the metal body after cutting.

(Means for Solving the Problems) The present invention has a transmission case 2 at the tip of a brush cutter main body 1, and handle support rods 3 and 5 protrude upwardly from the transmission case 2. At the same time, on the lower side of the transmission case 2,
The cutting blade body 13 rotates around a shaft 28 having a longitudinal axis.
The above objective was achieved by taking the following technical measures in a portable brush cutter equipped with:

That is, the present invention provides a cutting blade body 1 having a cutting blade part 12 at the outer end.
An upward recess 16 is provided in the center of the upper recess 1.
A driving wheel 8 that is rotatable around a horizontal axis and that is in contact with the ground is provided in the cutting blade body 13 .
Bevel gears 31 and 33 are attached to each of the shafts 28 and 30 in the transmission case 2, and the motor 10 is fitted to the handle support rod 3 so as to be relatively rotatable. a cylinder shaft 43 driven by;
An inner shaft 44 driven by the engine 9 is fitted within the cylinder shaft 43 so as to be relatively rotatable, and a bevel gear 48 attached to the cylindrical shaft 43 is attached to the bevel gear 33 on the shaft 30 for the drive wheel 8, and a hevel gear 49 attached to the inner shaft 44. are respectively engaged with bevel gears 31 on the shaft 28 for the cutting blade body 13 within the transmission case 2.

(Function) During reaping work, the operator holds the handle 6 of the brush cutter main body 1 and maintains a posture with the drive wheels 8 in contact with the ground. Then, the engine 9 rotates the cutting blade body 13 around the vertical outer cylinder shaft 28, and the motor 10 rotates the inner shaft 30 and the bevel gear mechanism 49 in the operating case 2.
31 and bevel gear mechanisms 24 and 23 to drive the drive wheels 8 around the horizontal axis, and the driving force drives the drive wheels 8 forward,
The cutting blade 12 of the rotating cutting blade body 13 cuts weeds and the like by moving backward, forward and backward, or moving left and right. In this case, the drive wheels 8 are positioned by the positioning mechanism 37 at the forward position A when moving in the front-rear direction such as forward movement, and at the lateral position B when moving in the left-right direction.

When changing the direction of the drive wheel 8, after releasing the positioning by the positioning mechanism 37, the operating lever 52 is rotated left and right.

When reaping while reciprocating in the front-rear direction and left-right direction, the motor 10 rotates the drive wheels 8 in forward and reverse directions.

(Example) Hereinafter, the present invention will be described in detail with reference to the illustrated example.
In the figures to FIG. 3, ■ is the brush cutter main body, the first transmission case 2, the connecting cylinder 3, the second transmission case 4, the support rod 5,
Consists of 6 handles.

On the lower side of the first transmission case 2, there is a cutting blade body 13 that rotates around the vertical axis 6, and a drive wheel 8 located below the center of the cutting blade body 13.
The second transmission case 4 is provided with an engine 9 for driving the cutting blade body 13 on the side opposite to the connecting cylinder 3, and the connecting cylinder 3 is provided with a forward/reverse motor 10 for driving the drive wheels 8. are installed respectively.

The first transmission case 2 is located at the lower end of the main body 1,
A connecting cylinder 3 is attached to the rear side of the first transmission case 2 so as to be inclined rearward and upward. The second transmission case 4 is attached to the inclined upper end of the connecting cylinder 3 in a direction perpendicular to the upper end thereof, and a support rod 5 is attached to the lower side of the second transmission case 4 so as to be inclined rearward and upward. There is.

The support rod 5 is stepped from the connecting cylinder 3 via the second transmission case 4, and the bracket 1) of the second transmission case 4
The angle can be freely adjusted in the vertical direction. The handle 6 has a bifurcated shape and is attached to the rear end of the support rod 5.

Here, the connecting cylinder 3 and the support rod 5 are both handle support rods 3, 5, and as long as they protrude upwardly from the first transmission case 2 and include the handle 6, they are straight wooden rods. There may be.

As shown in FIGS. 2 to 4, the cutting blade body 13 has a plurality of cutting blade parts 12 on the outer periphery (outer end) of the annular blade 7.

The cutting blade body 13 is composed of a disk having an upward concave portion 16 formed in the shape of a truncated cone in its central portion, and the blade 7 can be freely attached to and removed from a mounting portion 14 on the outer periphery of the lower end by a plurality of ports 15 in the circumferential direction. It is configured by being attached to.

As shown in FIGS. 3 to 5, the drive wheel 8 is supported by an inverted U-shaped bracket 17 via a support shaft 18 within a truncated conical upward recess 16 of the disk. The support shaft 18 is rotatably supported at both ends by bearings 19 of the bracket 17 around the horizontal shaft 6, and the drive wheel 8 is constituted by a pair of wheels 20 fitted around the support shaft 18 so as to be integrally rotatable. ing. A cylindrical gear case 22 having a disk member 21 at one end is interposed between the pair of wheels 20, and a bevel gear 23 fitted in the gear case 22 so as to be rotatable integrally with the support shaft 18, A bevel pinion 24 that meshes with the shaft is incorporated. The gear case 22 is fixed to the bracket 17 via a cylindrical body 25.

- As shown in FIG. 4, an outer cylindrical shaft 28 is rotatably supported around a vertical axis by a bearing holding portion 26 in the first transmission case 2 via a pair of upper and lower bearings 27, and this outer cylinder shaft 28 is Cylindrical shaft 2
An intermediate cylindrical shaft 29 and an inner shaft 30 are fitted within the intermediate cylindrical shaft 29 and 8, respectively, concentrically and relatively rotatably. There are 31 bevel gears on the upper end of the outer cylinder shaft 28, and a cutting blade body 1 on the lower end.
3 are provided so as to be rotatable together.

An operating lever 32 is fixed to the upper end of the intermediate cylinder shaft 29, and a bracket 17 for the drive wheel 8 is fixed to the lower end.

Further, a bevel gear 33 is provided at the upper end of the inner ring 30, and a bevel binion 24 is provided at the lower end thereof so as to be rotatable together. Note that the upper end of the inner shaft 30 is supported by a lid 34 mounted on the first transmission case 2 via a bearing 35.

As shown in FIGS. 4 and 7, the operating lever 32 protrudes outward through a long hole 36 formed in the side wall of the first transmission case 2 in the circumferential direction over an approximately 90 degree range.
By rotating the operating lever 32, the driving wheel 8 can be changed between a forward position A (imaginary line in FIG. 2) in which the drive wheel 8 can be moved forward and backward, and a lateral position B (indicated by a dotted line in FIG. 2) in which it can be moved left and right. . The operating lever 32 is moved to each position A-B by the positioning mechanism 37.
It can be locked with . This positioning mechanism 3
Reference numeral 7 indicates two pin holes 38 and 39 formed in the side wall of the first transmission case 2, an L-shaped positioning pin 41 supported by the operating lever 32 via a bracket 40, and a positioning pin 41 that is connected to the positioning pin 41. The positioning pin 41 is selectively engageable and detachable from the pin holes 38 and 39.

As shown in FIGS. 4 and 6, a cylinder shaft 43 and an inner shaft 44 are fitted concentrically into the connecting cylinder 3, and are rotatably supported by bearings 46 and 47 at both ends. cylinder shaft 43
A bevel gear 48 that meshes with the bevel gear 33 inside the first transmission case 2 is provided on the inner shaft 44 , and a bevel gear 49 that meshes with the bevel gear 31 inside the first transmission case 2 is provided on the inner shaft 44 .

As shown in FIGS. 1 and 6, the engine 9 is attached to the second transmission case 4 via a housing 5o and a bracket 51 on the side opposite to the connecting cylinder 3 and above the support rod 5. The output shaft 52 of this engine 9 is interlocked and connected to the inner shaft 44 via an electromagnetic clutch 53 within the housing 5o. Therefore, if you start engine 9,
The cutting blade body 13 can be driven to rotate around the vertical axis via the inner shaft 44, the bevel gear 49.31, and the outer cylinder shaft 28. Note that the electromagnetic clutch 53 may be omitted.

The motor 10 is fixed to a mounting plate 54 fixed to the connecting cylinder 3 near the second transmission case 4 so as to be parallel to the lower side of the connecting cylinder 3. Output shaft 5 of this motor 10
5 is interlockingly connected to the cylindrical shaft 43 via a small diameter gear 56 and a large diameter gear 57 in the second transmission case 4, as shown in FIG. Therefore, the output shaft 55 is
, gear 56.57, cylindrical shaft 43, bevel gear 48.
33, the drive wheel 8 can be driven to rotate about the horizontal axis via the inner shaft 30, the bevel pinion 24, and the bevel gear 23. The motor 10 is of a forward/reverse rotation type, and a changeover switch or start switch for causing the motor 10 to rotate forward/reverse is provided on the grip portion 58 of the handle 6.

The engine 9 includes a generator, and power is supplied to the electromagnetic clutch 53 and the motor 10 from the generator.

When cutting weeds, etc. with the brush cutter having the above configuration, the following steps should be taken.

FIG. 1 shows a state in which the drive wheel 8 is placed in the lateral position B. At this time, the positioning pin 41 of the positioning mechanism 37 is engaged with the pin hole 39, and the intermediate cylinder shaft 29 is positioned so that the drive wheel 8 is in the lateral position B. It is locked in such a way that it cannot be rotated.

Therefore, during work, the operator holds the pair of grips 58 of the handle 6 with the drive wheels 8 on the ground, maintains a posture so as not to fall to the left or right, and uses the power from the engine 9 to operate the cutting blade. The body 13 is rotated, and the front side is reciprocated from side to side by operating the changeover switch of the motor 10 as appropriate, and cutting is carried out by the rotation of the cutting blade body 13. That is, when a forward rotation command is given to the motor 10 by the changeover switch, the output shaft 55, gear 56, 57, cylindrical shaft 43, bevel gear 48° 33, inner shaft 30, bevel pinion 24
, the drive wheel 8 rotates in the normal rotation direction on the horizontal axis root in the longitudinal direction within the upward recess 16 via the bevel gear 23 and the support shaft 18, so that the front side of the brush cutter is rotated in the direction indicated by the arrow a in FIG. Since the blade moves in the direction, weeds and the like are cut by the cutting blade section 12 of the rotating cutting blade body 13. Then, after reaching a predetermined position in the left direction, when a reverse rotation command is given to the motor 10 using the changeover switch, the motor 10 is switched to reverse rotation, so that the drive tiii8 is reversed via the above-mentioned electric system. Accordingly, the front side of the brush cutter moves in the direction indicated by the arrow b in FIG. 8, and similarly, as the cutting blade body 13 rotates, weeds and the like are cut by the outer cutting blade part 12.

At this time, the support shaft 18 is oriented in the front-rear direction, but the drive wheel 8
When switching from forward rotation to reverse rotation or from reverse rotation to forward rotation, if the operator slightly shakes the handle 6 side to the left or right, the drive wheel 8 moves forward in a diagonal direction while moving left and right, as shown in Fig. 9. Since the cutting progresses in a zigzag pattern, it is possible to cut over a constant width C.

When mowing by moving the brush cutter forward or backward, the drive wheel 8
change the orientation to forward position A. That is, since it is in the horizontal position B in FIG. 4, first remove the positioning pin 41 from the pin hole 39 against the spring 42, unlock the operating lever 52, and then move the operating lever 52 to the position d in FIG. Rotate approximately 90 degrees in the direction of the arrow. Then, the driving wheel 8 rotates via the intermediate cylinder shaft 29 from the lateral position B to the forward position A as shown by the imaginary line in FIG. Fix it so that it cannot rotate again.

With this, the drive wheel 8 is in a forward state with the support shaft 18 facing left and right. Therefore, if the drive wheel 8 is rotated in the normal direction, it will move forward. As shown in FIG. etc. can be reaped.

Even in this forward state, if the motor 10 is rotated in the forward and reverse directions and the handlebar 6 is slightly swung left and right, the vehicle can move forward and backward in a zigzag pattern to the left or right, as shown in Figure 1).

In the embodiment, the brush cutter main body 1 is configured in a stepped manner and the engine 9 and the motor 10 are attached thereto.
and one support rod 5 extending rearward and diagonally upward, and the engine 9 and motor 10 may be mounted on the first transmission case 2, or the engine 9 and motor 10 may be mounted on the support rod 5. It may also be attached via a plate.

The drive wheels 8 may be fixed at the forward position A or the lateral position B, and may only be capable of forward and backward movement or left and right movement.

The cutting height can also be adjusted by dividing the blade 7 in the cutting blade body 13 into a plurality of pieces in the circumferential direction and making it possible to change the mounting position on both the upper and lower sides of the mounting portion 14 of the disk.

In addition, the cutting blade body 13 has an upward concave portion 16 formed in the center of a strip-shaped blade instead of a disk, and a cutter 7 is attached to the outer end of the blade. It may be fixed to

(Effects of the Invention) According to the present invention, the upward recess 16 is provided in the center of the cutting blade body 13, and the drive wheel 8 rotatably driven around the horizontal axis 6 is provided within the upward recess 16. , the worker does not need to support the weight of the brush cutter after cutting, and the worker does not need to move the brush cutter when moving it forward or backward or left and right. Therefore, it is easier and easier than before. Able to work efficiently.

Further, since the drive wheel 8 is located at the center of the cutting blade body 13, the weight balance is good even when the mower is moved by the driving force of the drive wheel 8, and a stable posture can be maintained. Moreover, the drive wheel 8 is the cutting blade body 1
3, the cutting height of the cutting blade body 13 is constant, the finish after cutting is good, and the resistance of the drive wheel 8 can be reduced. Furthermore, an upward recess 16 is provided in the center of the cutting blade body 13, and the drive wheel 8 is accommodated within this recess 16, so that the small diameter of the drive wheel 8 can be increased to ensure a stable posture. , the height in the vertical direction can be lowered, and the balance during work can be improved. Moreover, since the shaft 30 for driving the driving wheels 8 is fitted within the shaft 28 for driving the cutting blade body 13 so as to be relatively rotatable, the driving wheel 8 on the lower side of the cutting blade body 13 is driven. Despite the fact that
It can be made structurally more compact.

Furthermore, since the cutting blade body 13 is driven by the engine 9 and the drive wheel 8 is driven by the motor 10, the rotation of the drive wheel 8 can be easily changed. Since the inner shaft 44 for the cutting blade body and the cylindrical shaft 43 for the drive wheel are fitted into the support rod 3 so as to be able to rotate relative to each other,
Even though the cutting blade body 13 and the drive wheel 8 are driven, the structure can be made compact.

[Brief explanation of the drawing]

Figures 1 to 1) illustrate one embodiment of the present invention, in which Figure 1 is a side view of the brush cutting metal body, Figure 2 is a plan view of the front part of the brush cutter, and Figure 2 is a plan view of the front part of the brush cutter. Figure 3 is a bottom view of the same, Figure 4 is a cross-sectional side view of the same, Figure 5 is a cross-sectional front view of the drive wheel portion, Figure 6 is a cross-sectional side view of the second transmission case portion, and Figure 7 is a cross-sectional side view of the positioning mechanism portion. A sectional plan view, Fig. 8 is a perspective view of the working state, Fig. 9
Figures 1 to 1 are explanatory diagrams of working conditions. 1-Brush cutter main body, 2-1st transmission case, 3 series tube body, 4-2nd transmission case, 5--support rod, 7-blade, 8
- drive wheel, 9 - engine, 10 - motor, 12 - cutting blade section, 13 - cutting blade body, 28 - outer cylinder shaft, 29 - intermediate cylinder shaft, 3
〇-inner shaft, 32--operation lever, 37--positioning mechanism, 43--cylindrical shaft, 4. t-inner axis, A-forward position,
B - Lateral position. Patent applicant Kubota Tekko Co., Ltd. Agent Patent attorney Yasu 1) Toshio 1-・Kan,
. Figure 70 Figure 17 October 19, 1988

Claims (2)

[Claims] (1) A transmission case 2 is provided at the tip of the brush cutter body 1, and a handle support rod 3 is inclined upward from the transmission case 2.
. An upwardly recessed portion 16 is provided in the center of the cutting blade body 13 having A shaft 30 driven via the mechanisms 23 and 24 is fitted within the shaft 28 for driving the cutting blade body 13 so as to be relatively rotatable, and a bevel gear is attached to each of the shafts 28 and 30 within the transmission case 2. 31 and 33 are attached, and a cylinder shaft 4 driven by a motor 10 is attached to the handle support rod 3.
3 and an inner shaft 44 driven by the engine 9 are fitted inside to be relatively rotatable, and a bevel gear 48 attached to the cylindrical shaft 43 is attached to the bevel gear 33 on the shaft 30 for the driving wheels 8 and to the inner shaft 44. A portable brush cutter characterized in that the bevel gears 49 are engaged with the bevel gears 31 of the shaft 28 for the cutting blade body 13, respectively, within the transmission case 2. (2) A patent claim characterized in that the engine 9 is arranged on the handle 6 side, the motor 10 is arranged between the transmission case 2 and the engine 9, and is attached to the middle of the handle support rod 3 in the longitudinal direction of the rod. The portable brush cutter described in item 1.