JPH01320916A - Walking-type bush cutter - Google Patents

Abstract

PURPOSE:To provide a bush cutter capable of performing bush-cutting during forward motion as well as backward motion and cutting on an inclined ground by using a laterally swivellable cutting edge member having a cutting edge freely switchable between horizontal state and inclined state and placing the cutting edge member in front of a mobile vehicle freely switchable between forward motion and backward motion. CONSTITUTION:A mobile vehicle 3 is made to be rotatable around a horizontal shaft with a mobile vehicle motor 46 reciprocally driven by a dynamo of an engine. When the motor 31 is rotated, a reaping edge frame 23 is laterally swiveled around a supporting pin 26 to swivel the reaping edge member 4 in a state shown by the arrow C. When an operation lever 43 is released from a positioning part 41, the reaping edge supporting frame 23 is made to be freely rotatable around the shaft of the supporting pin 24 and the reaping edge member 4 is made to be switchable between a position on a horizontal plane and a position on an inclined plane. Each position is maintained by fixing the operation lever 43 to the positioning part 41.

Description

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

(Prior art) U.S. Pat. No. 4,267.686 (prior art example 1) and U.S. Pat. No. 4,559,768 describe walk-behind brush cutters that cut lawns, weeds, etc. while walking. (Conventional example 2
), Japanese Utility Model Publication No. 48-15238 (conventional example 3), Japanese Patent Publication No. 38-15909 (conventional example 4), etc. are known.

(Problems to be Solved by the Invention) Conventional example 1 is equipped with a control handle on the rear side of the brush cutter body, a cutting blade body that is forcibly driven around a vertical axis on the front side of the brush cutter body, and It is equipped with caster wheels that define the cutting height of the cutting blade body, and is further equipped with non-driven running wheels behind the cutting blade body.

Although this technology has some usefulness, since the running wheels are not driven, it is a so-called hand-pull type, and although it does not require much labor on flat land, it requires a considerable amount of labor on undulating terrain. Met.

Also, although it is possible to cut the grass by moving forward, it is extremely difficult to move the steering wheel left and right to cut the grass due to the large track width of the running wheels.
There was a risk of damaging the lawn, etc.

In conventional example 2, both the cutting blade body and the traveling wheels are driven by the installed engine, and although mowing work can be easily done while traveling on undulating terrain, the traveling wheels are
Since it has four wheels and axles, movement in the left and right directions is restricted, making it extremely difficult to cut grass in the left and right directions.

Furthermore, since the running wheels are driven by the engine, in order to rotate the wheels forward or reverse, a separate forward/reverse switching means is required in the transmission mechanism between the engine and the wheels.

In conventional example 3, the cutting blade body and the wheels are arranged in front and behind, the cutting blade body and the wheels are interlocked by a winding transmission means, and the cylindrical body having the cutting blade body at the lower end is tilted toward the rear. This reaper has an engine attached to the top of the cylinder, and although it is considered to be more handy than the conventional type 2 reaper, because the engine is located at the top of the cylinder, the front and rear weight balance is likely to be lost. There is a problem, and since the cutting blade body and wheels are driven by an engine, it is difficult to rotate the wheels in the forward and reverse directions compared to the conventional method 2.
It was just as difficult.

Conventional example 4 allows the cutting blade body to swing in the left and right directions in front of the wheels, and since the cutting blade body swings,
Although it has the advantage of creating beautiful mowing marks, the cutting blade cannot be tilted, making it impossible to cut sloped surfaces.

Furthermore, in any of the conventional techniques, the relative positional relationship between the cutting blade body and the wheels is fixed, and the relative position is not adjusted or changed in the horizontal or vertical direction, so mowing work while moving in the horizontal direction is not possible. It was difficult and the area to be cut was narrow. In addition, it has been difficult to efficiently cut down weeds and the like growing on slopes, such as the slopes of banks and road shoulders.

In the present invention, by providing a running body near the cutting blade body that supports the brush cutter body and can freely switch between forward and reverse directions around the horizontal axis, mowing work can be performed while moving forward and backward and left and right. Moreover, by providing the cutting blade body placed in front of the traveling body so that it can swing and move laterally, as well as rotate and hold around the axis in the front and rear directions, it can be used not only on the top of the ridge but also on sloped elevations. It is an object of the present invention to provide a walk-behind brush cutter that is capable of cutting crops.

(Means for Achieving the Object) The present invention provides a mowing machine in which a front end of a brush cutter body is provided with a forcibly driven cutting blade body, and a rear end of the brush cutter body is provided with a control handle. In order to achieve the stated purpose in the brushing machine, the following technical measures are taken.

That is, in the present invention, first, a running body that supports the brush cutter body and can be switched forward and reverse around the horizontal axis is provided near the cutting blade body, and in front of the running body, the running body can swing freely in the left and right directions. At the same time, the cutting blade body is provided through a holding means that is rotatably fixed around an axis in the front and rear direction so that the cutting blade surface of the cutting blade body can be held switchably between a horizontal plane and an inclined plane. The present invention is characterized in that the cutting blade body is attached to the brush cutter main body so as to be movable laterally via its support frame.

(Function) The traveling body 3 is rotated forward and backward by the electric motor 46, and when rotated forward, it is moved forward. When the cutting blade body 4 is forcibly driven in this forward movement state, the mowing work is performed.

Also, by swinging the cutting blade body 4 in the forward state,
For example, weeds on the ridge top surface F1 are cut.

Furthermore, the supporting frame 14 of the cutting blade body 4 is laterally moved to the position indicated by the symbol B in FIG. By tilting, weeds and the like on the sloped elevation F2 of the ridge F can be cut, and at this time, the traveling body 3 runs on the ridge top surface F1.

(Example) Embodiments of the present invention will be described in detail below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a brush cutter main body, an engine 2 is mounted on the upper part of the main body, and a running body 3 shown in the form of wheels is arranged on the lower side of the main body.

Reference numeral 4 denotes a cutting blade body, which is disposed on the front end side of the brush cutter main body 1, and which connects the output shaft 5 of the engine 2 and the receiving shaft 7 of the transmission case 6 through a flexible transmission shaft 8, so that the vertical Forcibly driven around the axis.

9 is a control handle, which includes a support rod 10 and a bifurcated handle rod 11.
It is provided on the rear side of the brush cutter main body 1 in an upwardly inclined shape.

The bifurcated handle rod 11 has a grip 12 and can be raised and lowered with respect to the support rod 10 by an angle adjustment device 13 such as a chrysanthemum seat.

The engine 2 has a generator, and the output shaft 5 is turned ON and OFF.
It has a clutch device that performs F.

Reference numeral 14 denotes a support frame, in which the rear ends (handle side) of two parallel link arms 15 are pivoted to one side of the brush cutter main body 1 with pins or shafts 16, and each front end is attached to a hitch fitting 17. By pivoting with a pin or shaft 18, posture A and posture B in Fig. 2 can be achieved.
It is possible to move laterally between the two while maintaining a parallel relationship on the horizontal plane.

Reference numeral 19 denotes a lateral movement fixing means, which is provided on the side of the brush cutter main body L and includes a fixing plate 21 having a positioning part 20, and an operation part provided on the side of the parallel link arm 15 which can be freely engaged with and detached from the positioning part 20. It consists of a lever 22, and by engaging and disengaging the operating lever 22 and manually operating it, the posture A,! :B allows for lateral movement and fixed holding.

Reference numeral 23 designates a cutting blade support frame, in which a motor bracket 25 is attached to the pitch metal fitting 17 via a support pin 24 having an axis in the longitudinal direction, and a swing fulcrum pin 26 having an axis in the vertical direction is attached to the motor bracket 25. is attached and extended toward the front of the traveling body 3, and a transmission case 6 is attached to the extended end.
has.

A bevel gear mechanism 27 (as shown in FIG. 3) is built into the transmission case 6, and transmits the rotational power of the receiving shaft 7 to the vertical cutter shaft 28 to drive the cutting blade body 4 shown in a disc shape. It is designed to be driven by switching between forward and reverse directions.

Note that on the cutting blade body 4, a cylindrical protector 29 is attached to the bolt 3.
It is attached by 0 and surrounds the cutter shaft 2,
This prevents cut grass, foreign matter, etc. from wrapping around the cutter shaft 28. The protector 29 may be formed by cutting and raising the central portion of the disk of the cutting blade body 4, or may be fixed by welding.

31 is a swing motor, and the generator of engine 2 (
(not shown), the motor bracket 2
5 with the motor shaft 32 facing downward.

Reference numeral 33 denotes a swinging guide plate, which is fixed to the base end of the cutting blade support frame 23 and has a longitudinally long slit 34, into which a slider 35 is slidably fitted. The slider 35 and the motor shaft 32 are connected by an arm 36.

Therefore, when the motor 31 is rotationally driven, the arm 36
Trying to rotate slider 35 through slider 3
5 is fitted into the slit 34, so that the cutting blade support frame 23 can be swung in the left and right directions about the fulcrum bin 26, and the cutting blade body 4 can be swung as shown by arrow C in FIG. become.

In FIGS. 3 and 4, reference numeral 37 indicates a bolt for mounting the fulcrum bottle 26, and reference numeral 38 indicates a distance collar.

39 is a holding means for the support frame, and the hitch metal fitting 17
A guide plate 42 having a vertical guide part 40 and a positioning part 41 is fixed to the front surface of the guide plate 42.
0, the operating lever 43 is inserted through the operating lever 43, and the base of the operating lever 43 is pivotally connected to the side surface of the cutting blade support frame 23 (which may be a motor bracket) via a pin 44, and a helical spring 45 is attached to the pin 44. is provided so that the operating lever 43 is urged to engage with the positioning portion 41.

That is, the guide plate 42 having the positioning part 41 and the operating lever 43 constitute the holding means 39, and when the operating lever 43 is engaged with the positioning part 41,
The cutting blade support frame 23 is unrotatably locked, that is, held, around the longitudinal axis of the support pin 24, and when the operating lever 43 is removed from the positioning part 41, it rotates around the axis of the support pin 24. The cutting blade support frame 23 is made freely rotatable, and the cutting blade body 4 attached to the tip of the cutting blade support frame 23 is switched between a position on a horizontal plane and a position on an inclined plane. Each position is held by engaging the operating lever 43 with the positioning portion 41 at each position shown in FIG.

Reference numeral 46 denotes an electric motor for the traveling body, which is driven in forward and reverse directions via the generator of the engine 2;
6 is transmitted to an output shaft (motor shaft) to a gear transmission body (not shown) in a transmission gear box of the traveling body 3, so that the traveling body 3 represented by wheels can be switched and driven around a horizontal axis.

Further, reference numeral 47 denotes a traveling body support shaft, which extends vertically downward from the brush cutter main body 1, and supports the traveling body 3 so that the transmission gear box of the traveling body 3 can be turned around with the support shaft 47 as a turning axis. ing. Reference numeral 48 denotes the direction changing device, which changes the position of the traveling body 3 in the front-rear direction and left-right direction, and is composed of an operating lever 49 and a guide plate 51 having a positioning hole 50 into which the lever is engaged and disengaged.

In the above embodiment, in order to cut a flat surface such as the top surface F1 of the ridge F, the cutting blade body 4 is held at position A in FIG. 2, the traveling body 3 is driven forward, and the motor 31 is By activating , the cutting blade body 4 is swung as shown by arrow C around the fulcrum pin 26 while moving forward.

At this time, the cutting blade body 4 is driven by the engine 2 via the flexible shaft 8, and since the cutting blade body 4 is allowed to swing and oscillates, the operator must grasp the control handle 9. That will be enough.

Note that when there is no need to swing the cutting blade body 4, it is sufficient to stop the motor 31, and horizontal mowing is also possible by changing the direction of the traveling body 3 horizontally and rotating the motor 46 in the forward and reverse directions. .

When mowing the slope F2 of the ridge F, the operation lever 22 of the lateral movement fixing means 19 is disengaged from the engagement part 20,
Move the supporting machine frame 14 outward and press the operating lever 22 again.
By locking the cutting blade body 4, the cutting blade body 4 is changed from the A position to the B position in FIG. Rotate the blade support frame 23, and here,
The cutting blade body 4 is placed along the inclined vertical plane F2 as shown in FIG.

In this state, the mowing body 3 moves forward on the ridge top surface Fl and rotates the cutting blade body 4 to cut the grass.

In the above embodiments, the cutting blade body 4 may be a swing cutter, a drum cutter, a reciprocating cutter, a blade cutter, etc., and the traveling body 3 may be of a crawler type. Furthermore, the motors 46 and 31 may be rotated in forward and reverse directions using pulse signals, or the direction of rotation may be switched at regular intervals.

(Effects of the Invention) The present invention is as described above, and since a running body is provided near the cutting blade body that supports the brush cutter body and can freely switch between forward and reverse directions around the horizontal axis, the front and rear weight It is possible to mowing forward and backward with good balance, and the maneuverability is stable, and it can be used on flat areas.
Can perform mowing work regardless of slope.

Furthermore, in front of the traveling body, there is a blade that can swing freely in the left and right directions, and can be rotated and fixed around an axis in the front and back direction so that the cutting blade surface of the cutting blade body can be switched between a horizontal plane and an inclined plane. Since the cutting blade body is provided through the holding means, it is possible to finish the separate road beautifully, and the cutting blade body can cut grass along a slope while the traveling body runs on a flat ground.

In addition, since the cutting blade body is attached to the brush cutter body so that it can be moved laterally via its support frame, the running body can run stably on flat ground while the lightweight cutting blade body is attached to the side slope. You can work along the slope, which is especially effective for mowing slopes of banks.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is an overall side view;
Figure 2 is an overall plan view showing the operating state, Figure 3 is an enlarged side view of the cutting blade body, Figure 4 is an enlarged plane view of the swinging part, and Figure 5 is Figure 4 E-E. 6 is a diagram showing the line arrows taken along line D-D in FIG. DESCRIPTION OF SYMBOLS 1...Brush cutter body, 2...Engine, 3...Traveling body, 4...Mowing blade body, 9...Control handle, 14...
... Support machine frame, 19 ... Lateral movement fixing means, 23 ...
・Cutter blade support frame, 24...support pin in the front and back direction,
26... Swing fulcrum pin, 31... Swing motor, 39... Holding means, 46... Traveling body motor.

Claims (2)

[Claims] (1) In a brush cutter that is equipped with a forcibly driven cutting blade body at the front end of the brush cutter body and a control handle at the rear end of the brush cutter body, A running body is installed in front of the running body that supports the main body of the brush cutter and can be freely switched between forward and reverse directions around a horizontal axis. A walk-behind brush cutter characterized in that a cutting blade body is provided via a holding means that is rotatably fixed around an axis in the front and back direction so as to be held switchably between an upper position and an inclined surface. (2) Claim (2) characterized in that the cutting blade body is attached to the brush cutter main body so as to be able to move laterally via the supporting machine frame.
1) The walk-behind brush cutter described above.