JPS6013322Y2 - portable power brush cutter - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is provided with the arm base support and a pair of left and right grips, and the inclination of the cutting blade around the center axis of the machine body and with respect to the center axis of the machine body. The present invention relates to a portable power brush cutter that is configured so that both can be adjusted with one touch.

(Prior art) For example, a first operating tool to be gripped with the right hand is attached to a support tube,
A second operating tool that can be held with the left hand is attached to the operating tube that is rotatably inserted and supported in the support tube, and the second operating tool is rotated while holding the first operating tool with the right hand. A portable brush cutter that is configured to rotate the operation tube relative to the support tube and adjust the inclination of the cutting blade support rod supported at the tip of the operation tube around the center axis of the machine is known, for example, as disclosed in Japanese Patent Application Publication No. No. 53-11753.

(Problem to be solved by the invention) However, while the cutting blade is positioned parallel to the sloped or curved land at regular intervals, the plants can be quickly cut so that the length of the initial plants is constant. In order to accurately cut the grass, it is not enough to simply adjust the angle of the cutting blade around the center axis of the machine;
In other words, the inclination angle of the operating tube with respect to the axis can be changed. In other words, the cutting blade can be moved not only in the left and right directions, but also in the
It is preferable to be able to swing it back and forth as well.

Moreover, it is desired to be able to quickly perform such rocking in the left-right direction and the front-back direction.

The present invention was devised under the above circumstances, and the problem to be solved is a portable mower having a first grip that is held with the right hand and a second grip that is held with the left hand. To provide a portable brush cutter that can quickly and easily make adjustments to tilt a cutting blade around the axis of an operating tube and change the inclination angle with respect to the axis of the operating tube.

(Means for solving the problem) In order to solve the above problem, the portable brush cutter of the present invention has the following features:
a support tube 2 that is integrally attached to the engine 1 and includes a forearm base support 3 and a first grip 4;
an operation tube 8 which is relatively rotatably and relatively slidably inserted in the axial direction and has a second niger lip 7 at the intermediate portion and a cutting blade support rod 6 at the tip; the support tube 2 and the operation tube; 8, a locking mechanism 9 capable of allowing relative movement of the engine 1 and preventing the relative movement; a cutting blade 10 supported by a bracket pivotally attached to the tip of the cutting blade support rod 6; A conduction shaft having flexibility at least at the tip thereof, which connects the blades 10 through the operation tube 8 and is covered with a flexible tube 11 at least near the tip of the operation tube 8 and between the cutting blades 10. 12.

(Function) For example, the first grip 4 and the forearm base support 3 are supported by the right arm or right hand, and the second grip 7 is gripped by the left hand.

When the lock mechanism 9 is released, the operating tube 8 can be rotated relative to the support tube 2 by rotating the second grip 7 relative to the first grip 4.

When the operation tube 8 rotates, the cutting blade 10 swings around the axis of the operation tube 8 because the cutting blade 10 is substantially supported by the cutting blade support rod 6 at the tip of the operation tube 8 .

After rocking by a predetermined amount, when the locking mechanism 9 locks the relative movement between the operating tube 8 and the support tube 2, the attitude of the cutting blade 10 is fixed at the position tilted left and right by a predetermined amount.

On the other hand, when the operation tube 8 is allowed to move relative to the support tube 2 and is slid in the axial direction, the cutting blade support rod 6 attached to the tip of the operation tube 8 moves back and forth. move.

However, since the length of the power transmission shaft 12 connecting the cutting blade 10 and the engine 1 and the flexible member 11 covering it remain unchanged, the bracket supporting the cutting blade 10 pivots with respect to the cutting blade support rod 6. Therefore, when the cutting blade support rod 6 moves back and forth as described above, compressive force or tensile force acts on the flexible tube 11, and this compressive force or tensile force causes the cutting blade supported by the bracket to 10 is pivoted about the pivot axis of the bracket, ie perpendicular to the operating tube.

Therefore, at this time, the cutting blade 10 is swung back and forth so that the angle of inclination with respect to the axis of the operating tube 8 changes.

After the rotary blade is oscillated by a predetermined amount, when the lock mechanism prevents the operation tube 8 from moving relative to the support tube 2 again, the cutting blade 10 is fixed in its posture while being oscillated back and forth by a predetermined amount. Ru.

(Effects) As described above, in the portable power brush cutter of the present invention, by releasing the lock mechanism and rotating the operating tube 8 relative to the support tube 2, the angle of the cutting blade 10 can be changed in the left-right direction. By moving the operation tube 8 relative to the support tube 2 in the axial direction, the angle of the cutting blade 10 can be changed in the front-back direction.

In other words, by moving the operating tube 8 relative to the support cylinder 2, both the horizontal and longitudinal angles of the cutting blade 10 can be adjusted quickly and easily.

(Description of Embodiments) Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

The embodiment shown in FIGS. 1 to 3 has bolts 13, 13,
An inverted J-shaped or inverted U-shaped forearm base support 3 is attached to the rear upper surface of the support tube 2 fixed to the engine 1 so as to be rotatable back and forth. Grip 4 is installed upright.

The forearm base support 3 and the first grip 4 are each supported by one arm of the operator, typically the right forearm base and right hand.

The first grip 4 is screwed onto the support cylinder 2, and has a pressing member 15 disposed at the tip of its screw shaft 14.

Further, an operating tube 8 is fitted into the support tube 2 so as to be freely rotatable and slidable back and forth.

By tightening the first grip 4 and bringing the pressing member 15 into pressure contact with the operating tube 8, the operating tube 8 can be locked to the support tube 2.

Although the locking mechanism 9 can be configured in this manner, it is also possible to employ other known locking mechanisms.

The operation tube 8 is fitted with a horizontally single-shaped second lip 7 which is held by one hand of the operator, generally the left hand, while a cutting blade support rod 6 extending diagonally downward and forward is fixed to the tip 5. There is.

A bracket is attached to the tip 16 of the cutting blade support rod 6 so as to be pivotable about a pivot 17 perpendicular to the operating tube 8, and the cutting blade 10 is supported by this bracket.

Further, a flexible power transmission shaft 12 covered with a flexible tube 11 is disposed between the cutting blade 10 and the engine 1.
By inserting the blade into the operating tube 8, the rotational driving force of the engine 1 is transmitted to the cutting blade 10.

In the above embodiment, the flexible tube 11 covers the entire length of the transmission shaft 12, but the flexible tube 11 may cover only the front part of the transmission shaft 12. In this case, the rear part of the transmission shaft 12 may be covered with the flexible tube 11. A rigid shaft is also possible.

Reference numeral 18 denotes a metal sleeve attached to the rear end of the flexible tube 11, and a retaining ring 19 is fitted to the outer periphery of the sleeve to ensure smooth relative rotation between the flexible tube 11 and the support tube 2. At the same time, movement of the flexible tube 11 in the axial direction with respect to the support cylinder 2 is restricted.

Further, the rotational driving force of the engine 1 is transmitted to the transmission shaft 12 via the clutch 20.

In the embodiment shown in FIG.
A spring 22 is attached to the support tube 2 through the support tube 2 and exerts a downward tensile force on the swing rod 21.
The structure is similar to that of the embodiment shown in FIG. 1 except for the structure disposed in between.

The present invention can take various forms other than those shown in the above embodiments.

For example, as the first grip 4, a rod-shaped one can be used, or a support cylinder 2 covered with vibration-proof rubber can be used.

Moreover, it goes without saying that the second lip 7 is not limited to the shape of a single horizontal character.

Further, as the locking mechanism 9, various known means other than those described above can be employed.

Next, the operation of the brush cutter of the present invention will be explained based on FIGS. 1 to 3.

The operation tube 8 is attached to the support tube 2 so that it can rotate and slide forward and backward, so when the first grip 4 is loosened and the lock between both 8 and 2 is released, the operation tube 8 can be rotated. By doing so, the cutting blade 10 can be tilted to a desired rotation angle position around the central axis of the machine body.

Further, when the operation tube 8 is moved relative to the support cylinder 2 in the front and back direction, the cutting blade support rod 6 that substantially supports the cutting blade 10 is moved.
moves back and forth, but the total length of the power transmission shaft 12 and the flexible tube 11 does not change, so a tensile or compressive force is applied to the flexible tube 11 and the power transmission shaft 12, and this force moves the cutting blade 10 toward the pivot 1.
Rotate it back and forth around point 7.

In this way, the angle of inclination of the cutting blade 10 with respect to the axis of the operation tube can be changed, that is, the inclination from front to back can be changed.

When the first grip 4 is then tightened, the operating tube 8 is locked to the support tube 2 by the locking mechanism 9, and the cutting blade 10 is held at a predetermined inclination angle position.

FIG. 2 shows a state in which the operating tube 8 is pulled rearward and the cutting blade 10 is held substantially horizontally, and FIG. 3 shows a state in which the operating tube 8 is pushed forward and the cutting blade 10 is tilted at a predetermined angle.

According to the present invention, as described above, the cutting blade can be easily adjusted in two directions, ie, the left-right direction and the front-back direction, and the locking mechanism necessary for adjusting the inclination angle in the two directions can also be used as one mechanism.

Therefore, even in mowing work on sloping or uneven ground, the cutting blade can be tilted to the optimum position to perform the work, and the structure can be simplified to suppress a rise in manufacturing costs.

Furthermore, as secondary effects, the following effects can be expected with the portable power brush cutter of the present invention.

The support tube and engine are supported by one arm of the worker, generally the right arm, through the forearm base support and the first grip, and are always kept in the same posture, so they can be easily used on slopes as shown in Figure 5. When working on a flat surface, the worker can continue working in a natural position without having to lift his right upper arm to the side.

Furthermore, since the weight of the machine is directed approximately directly below the right arm, the machine can be supported easily.

Therefore, even when cutting grass on a slope, the operator can continue working for a long time with less fatigue.

Since the engine is always stationary and maintains a vertical position, the operation tube can be easily rotated, and the diaphragm type engine, which was required for engine rotation in the conventional model, can be easily operated. Instead, a float engine can be used, which is cheaper and easier to repair.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, FIG. 1 is a perspective view thereof, FIGS. 2 and 3 are vertical side views, FIG. 4 is a perspective view of another embodiment, and FIG. 5 shows the state of use. FIG. 1...Engine, 2...Support tube, 3.
... Forearm base support, 4 ... First grip, 5 ... Tip of operation tube, 6 ... Cutting blade support rod, 7 ... ...Nigerip, 8...
...Operation tube, 9...Lock mechanism, 10...
... Cutting blade, 11 ... Flexible tube, 12 ...
・Transmission shaft.

Claims (1)

[Scope of utility model registration request] a support tube 2 that is integrally attached to the engine 1 and includes a forearm base support 3 and a first grip 4;
An operation tube 8 is inserted and supported in a manner that allows relative rotation and relative sliding in the axial direction, and has a second niger lip 7 at the intermediate portion and a cutting blade support rod 6 at the tip, and the support tube 2 and the operation tube 8. A locking mechanism 9 that allows relative movement of the pipe 8 and prevents relative movement; a cutting blade 10 supported by a bracket pivotally attached to the tip of the cutting blade support rod 6; A power transmission shaft having flexibility at least at the tip thereof, which connects the blades 10 through the operation tube 8 and is covered with a flexible tube 11 at least near the tip of the operation tube 8 and between the cutting blades 10. 12. A portable power brush cutter comprising: