JPH0515720U - Portable power brush cutter - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a portable power brush cutter configured so as to be able to perform stable and efficient mowing work of narrow weeds, banks, weeds growing in ditches, etc. With the goal. In a portable power brush cutter in which an engine is integrally connected to a base end of an operation pipe and a rotary blade is supported at a tip of the operation pipe, the operation pipe is a support pipe on a base end side, Is separated into a slide tube that can slide and expand and contract, and the angle of the rotary blade with respect to the axis of the operation tube can be easily changed by expanding and contracting this operation tube. A forearm base support and a first grip protruding substantially horizontally are provided, and a second grip protruding substantially horizontally is provided on the left side of the slide tube.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a portable power brush cutter, and more particularly, to a horizontal or sloped surface in a relatively narrow left-right direction such as the top and side surfaces of a field ridge, the side surface of a bank, or the bottom or side wall of a groove. It has been improved so as to be able to quickly and efficiently mow grass that grows in areas where

[0002]

[Problems to be solved by conventional techniques and devices]

 A so-called engine-integrated portable power brush cutter connects an engine to the base end of a control pipe of a specified length, and rotates in the plane at a specified angle to the axial center of the control pipe on the tip side. The rotary output of the engine is transmitted to the rotary blade via a transmission shaft that is inserted inside the operation tube, and the rotary blade is rotated. Then, a grip or an operation handle for the operator to grip is attached to the operation pipe, and while gripping these grips or handles, the operator swings the operation pipe in the left-right direction, Work to mow the weeds that grow on the ground.

By the way, the place where the mowing work should be performed is not always a horizontal surface, but there are many inclined portions such as a slope of a bank and a ridge of a field. The tilt may be tilted in the left-right direction when viewed from the operator, or may be tilted in the front-rear direction when viewed from the operator. Further, when the vehicle is inclined in the front-rear direction, it may be an uphill slope or a downhill slope. In a general portable power brush cutter of this type, the rotary surface of the rotary blade is designed to rotate within a plane at a constant angle with respect to the axis of the operating tube. This angle is usually set so that when the operation tube is held tilted so that the rotary blade at the tip is lowered near the ground, the rotary blade rotates in a horizontal plane parallel to the ground.

In such a brush cutter having a fixed angle of rotation with respect to the operation pipe, when the ground to be mowed is tilted in the left-right direction when viewed from the operator, the operation pipe is moved to the center of the shaft. By tilting it around, the rotary surface of the rotary blade can be positioned horizontally with respect to the ground. However, when the ground to be mowed is inclined in the front-back direction as seen from the operator, it is not possible to easily position the rotary blade horizontally with respect to the ground, and the mowing is done. The work will be difficult.

In order to solve such a problem, it is possible to change the angle in the front-rear direction of the rotary blade supported at the tip of the operation tube, that is, the angle of rotation of the rotary blade with respect to the axis of the operation tube, if desired. The constructed brush cutter is proposed, for example, in Japanese Utility Model Publication No. 60-13322. According to such a type of brush cutter that can change the angle of the rotary blade in the front-rear direction, even if the surface to be mowed is uphill in the front-rear direction as seen from the operator, However, the rotary blade can be adjusted so that it is parallel to the surface to be trimmed.

However, in the portable dynamic brush cutter proposed in Japanese Utility Model Publication No. 60-13322, the rotary surface of the rotary blade is adjusted so as to be parallel to the ground to be mowed. Although it is preferable in the sense that the operation tube can be operated, it was found that the following inconvenience still exists when the operation tube is swung left and right.

That is, in the portable power brush cutter disclosed in the above-mentioned publication, a substantially inverted U-shaped forearm base support for holding the operator's forearm base so as to project upward toward the base end side of the operation tube is provided. It is mounted so as to be swingable in the front-back direction, and the first grip is formed so as to project upward in front of the site where the forearm base support is provided, and further forward by a predetermined length from this grip. In, a second grip is provided which protrudes to the side while bending in a substantially L shape. In such a portable power brush cutter, by inserting the right forearm base into the forearm base support, while holding the first grip by the arm and holding the second grip by the left hand, Supported. Since the forearm base support, the first grip, and the second grip are all provided so as to project above the axis of the operation tube, the operation tube is swung left and right. In doing so, the part displaced upward from the axis of the operating tube is pushed in the left-right direction.

On the other hand, since the center of gravity of the entire portable power brush cutter is almost on the axis of the operation tube, if a force in the left-right direction is applied to a portion above the operation tube as described above. , Moment acts so that the entire brush cutter rotates around the axis of the operation tube.

By the way, when the ground to be mowed is relatively wide in the left-right direction, when the operation tube is swung left and right, the sense of instability does not occur so much, but the details of the invention When performing the mowing work in a relatively narrow area as described at the beginning of the description, the operation tube must be frequently oscillated alternately to the left and right. In order to improve the efficiency of the mowing work, it is necessary to swiftly perform such a swing operation that alternates between left and right.

Then, when the swinging direction is changed, the force in the left-right direction, which should be given through each of the grips, must be relatively large, and in this case, for the above-mentioned reason, the brush cutter is used. The whole tends to rotate around the axis of the operating tube. To counteract this tendency, both arms must be put into force, which significantly increases fatigue during work, creates instability for the worker, and does not actually mow. If the dispenser rotates unsteadily around the axis of the control tube, the rotary blade that is tilted with respect to the ground may inadvertently bite into the ground. Means a significant deterioration in workability.

As described above, even in the case of the rotary blade angle changing type brush cutter disclosed in Japanese Utility Model Publication No. 60-13322, the operation pipe is repeatedly swung frequently in a relatively narrow space. It was not always suitable for speedy mowing work.

The present invention was devised under the circumstances described above, and solves the above-mentioned problems of the related art, and the surface to be mowed is not only in the left-right direction when viewed from the operator, but also in the front-back direction. Even if the ground is inclined in any direction, or even if the ground is inclined in a relatively narrow area in the width direction, the reaping work in such an area can be carried out quickly and with a sense of stability and with less fatigue. It is an object of the present invention to provide a portable power brush cutter that can be used.

[0013]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention takes the following technical means. That is, the portable power brush cutter of the present invention is connected to an operation tube of a predetermined length, a rotary blade supported at the tip of this operation tube so as to be pivotable in the front-rear direction, and to the base end of the operation tube. In a portable power brush cutter having an engine and a transmission shaft inserted into the operation pipe for transmitting the rotational output of the engine to the rotary blade, the operation pipe is provided on a support pipe on the proximal end side. The slide tube is configured to be slidable in the axial direction, and by rotating the slide tube relative to the support tube, the rotation angle of the rotary blade about the pivot axis in the longitudinal direction can be changed. While constructing the blade angle adjusting mechanism, a forearm base support tool having a substantially inverted U-shaped section that holds the upper surface of the forearm base of the operator is fixed to the right side of the support tube on the base end side, and the forearm base support tool is provided. From the site to the forearm length A first grip that protrudes in a substantially horizontal direction is provided on the front right side, and a second grip that protrudes in a substantially horizontal direction is provided on the left side of the slide pipe, and the first grip is attached to the support pipe by a screw method. It is characterized in that it is connected to each other and has a function of fixing and fixing the slide tube to the support tube.

[0014]

[Operation and effect of the device]

 The operator basically inserts the forearm base of the right arm into the forearm base support from below and holds the first grip, and the left hand holds the second grip, thereby basically holding the portable power brush cutter of the present invention. Support. In that state, when the first grip is rotated in the screw loosening direction to release the fixation of the slide tube to the support tube, the second grip or the slide tube is moved back and forth, so that the longitudinal angle of the rotary blade at the tip of the operation tube, That is, the angle of the rotation surface of the rotary blade with respect to the axis of the operation tube can be changed as desired. After changing the angle of the rotary blade in this way, rotate the first grip again in the screw tightening direction to fix the slide tube to the support tube and keep the rotary blade angle at the changed angle. can do.

When the rotational speed of the engine is increased by operating a throttle lever provided at an appropriate portion of the operation pipe or each grip, the rotational output of the engine is transmitted by a transmission shaft inserted inside the operation pipe. Is transmitted to the rotary blade via the, and the rotary blade starts rotating. In this state, the operation pipe is swung to the left and right while the cutting work is performed.

By the way, the portable power brush cutter of the present invention is supported by the operator's arm, and receives the swinging force in the left-right direction with respect to the operating pipe, the first grip, the second grip, and the forearm base support. All the tools are provided so as to project to the side of the operation tube.

Therefore, the swinging force applied to the operation tube in the left-right direction via each of the grips and the forearm base support acts substantially in the left-right direction with respect to the axis of the operation tube. Normally, the center of gravity of this type of engine-integrated power brush cutter is located approximately on the axis of the operation tube, so that the swinging force does not generate a moment around the axis of the operation tube. As a result, even when it is necessary to mow and scrub a relatively narrow area while frequently oscillating the operation tube to the left and right, the mowing machine is operated by the shaking force given by the operator for such shaking operation. There is no problem of swaying around the axis of the pipe, and it will be possible to continue extremely stable work.

In addition, as described above, in the power portable brush cutter of the present invention, the angle of the rotary blade with respect to the operation tube axis can be easily changed while holding the first grip or the second grip. Therefore, in particular, in a region relatively narrow to the operator, such as a field ridge, a bank, or a narrow groove, a horizontal surface and a slope are present in combination. The work of clearing the place can be performed stably and quickly.

[0019] In the actual place where mowing work is performed using this type of brush cutter, there are many ridges, banks or grooves in the fields as described above, so the workability of the mowing work in such a place is improved. It can be said that the invention of the present application, which can be carried out, is extremely useful as compared with any conventional brush cutter.

[0020]

[Explanation of Examples]

 Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. FIG. 1 is a perspective view showing the overall configuration of a portable power brush cutter 1 of the present invention. The operation tube 2 extending in a straight line as a whole has a support tube 4 to which an engine 3 is integrally connected at a base end thereof, and a slide tube 5 which is axially slidably inserted into the support tube 4. A transmission shaft holding pipe 7 for accommodating and supporting the flexible transmission shaft 6 is inserted inside the operation pipe 2. The entire length of the transmission shaft holding pipe 7 is longer than the length of the operation pipe 2, and the portion extending further forward from the operation pipe 2 is configured to have at least flexibility. In the above description, the length of the operation tube 2 refers to the length of the slide tube 5 slidable with respect to the support tube 4 in a state in which the slide tube 5 is advanced to the planned most front end.

The transmission shaft holding pipe 7 is held at an appropriate portion thereof so as not to be axially movable relative to the support pipe 4, and the transmission shaft 6 of the transmission shaft 6 inserted through the transmission shaft holding pipe 7 is inserted. The base end is connected to a clutch drum 9 which is rotatably supported in a clutch housing 8 arranged at a connecting portion between the support pipe 4 and the engine 3.

At the tip of the operation tube 2, that is, the tip of the slide tube 5, a base end of a rotary blade support arm 10 extending obliquely downward and extending forward is connected and fixed, and the rotary blade support arm 10 is fixed. A rotary blade support bracket 12 is supported on the tip of the rotary blade support bracket 12 so as to be pivotable about a lateral axis 11. In this rotary blade support bracket 12, a spindle (not shown) of a disk-shaped rotary blade 13 is rotatably supported, and at the rotary blade support shaft, the tip of the transmission shaft holding tube 7 can be moved. The tip of the transmission shaft 6 inserted through the flexible portion is connected. At the same time, the tip of the transmission shaft holding tube 7 is connected to the rotary blade support bracket 12.

On the other hand, of the operation tube 2, a support tube 4 integral with the engine 3 is provided with a forearm base support tool 14 and a first grip 15 which are supported or gripped by the right arm of the operator. Further, the slide tube 5 of the operation tube 2 is provided with a second grip 16 which is gripped by the left arm of the operator.

As shown in FIG. 3, the forearm base support 14 is formed of a plate member having a substantially inverted U shape, preferably a predetermined width, so as to hold the upper surface of the forearm base of the operator. There is. The axial position on the support tube 4 where the forearm base support 14 should be provided should preferably be provided slightly behind the center of gravity G of the entire brush cutter 1. The fixing means is not limited, and for example, the bracket band 17 is fitted and fixed to the support tube 4, and the forearm base support 14 is fixed thereto by an appropriate means such as screw means or welding. do it. An important point in providing the forearm base support tool 14 in the present invention is that it is provided on the side of the support tube 4. More specifically, when the operator's forearm is inserted into the substantially U-shaped forearm base support 14, the forearm is positioned so as to be parallel to the support tube 4 on the right side. Of.

The first grip 15 has a length suitable for being held by an operator's hand, and is on the same side as the side on which the forearm base support 14 is provided, that is, on the right side of the support tube 4. In addition, it is provided so as to face sideways and project in a substantially horizontal direction. The first grip 15 is attached to the support tube 4 by a screw method, as shown in detail in FIG. That is, a screw shaft 18 is formed at the base of the first grip 15, and the screw shaft 18 is configured to be screwed into a screw hole 19 formed in a penetrating side wall of the support tube 4. The tip of the screw shaft 18 of the first grip 15 screwed into the screw hole 19 in this manner is directly or directly attached to the surface of the slide tube 5 inserted into the support tube 4 via the pressing block 20 or the like. It is contacted indirectly. Therefore, the first grip 15 increases the pressing force on the slide tube 5 at the tip by rotating the first grip 15 in the screw tightening direction of the screw shaft 18, and fixes the slide tube 5 to the operation tube 2. In addition, by rotating the screw shaft 18 in the screw releasing direction to loosen the pressing force against the slide tube 5, the slidable state of the slide tube 5 with respect to the support tube 4 can be selected.

The position at which the first grip 15 should be provided is supported by the forearm base supporter with a distance substantially equal to the length of the forearm of the worker whose base is inserted into the forearm base supporter 14. It should be placed in a position where it can be grasped naturally by the arm.

On the other hand, the second grip 16 is provided so as to protrude to the right in the substantially horizontal direction with respect to the slide tube 5. The second grip 16 can be attached by any suitable means, such as via a clamp band 21. Since the second grip 16 is gripped by the arm opposite to the arm that grips the first grip 15, the protruding direction with respect to the operation tube is the opposite direction to the first grip 15. Needless to say. In FIG. 5, reference numeral 22 denotes a support band fastening tool for connecting to the front end locking tool 23a of the support band 23 attached to the body of the worker.

In the above configuration, when the first grip 15 is rotated in the loosening direction and the slide tube 5 is slid in the axial direction with respect to the support tube 4, the angle of the rotary blade with respect to the axis 10, that is, The angle in the front-rear direction with respect to the axis of the operation tube 2 can be changed. That is, since the total length of the transmission shaft holding pipe 7 is constant, when the slide pipe 5 is advanced to extend the entire length of the operation pipe 2, the tip portion of the transmission shaft holding pipe 7 is drawn into the slide pipe 5. As a result, the rotary blade support bracket 12 to which the tip of the transmission shaft holding pipe 7 is connected pivots in the direction of the symbol p around the shaft 11, while retracting the slide pipe 5 to operate the operation pipe. When the total length of 2 is shortened, the tip end portion of the transmission shaft holding tube 7 comes to be extended from the tip end of the slide tube 5, so that the rotary blade 13 pivots about the shaft 11 in the direction of arrow q. is there.

The angle of the rotary blade 13 set as desired by changing the overall length of the operation tube 2 in this manner rotates the first grip 15 in the screw tightening direction, and the slide tube 5 with respect to the support tube 4. It is held by fixing.

Since the rotation of the first grip 15 in the loosening direction and the rotation of the screw tightening direction can be performed while holding the first grip, the first grip 15 and the second grip 16 are gripped to operate the operation pipe. It is possible to easily change the angle of the rotary blade 13 as desired at any time when the swinging operation of 2 is performed.

The operator inserts the forearm base of his right arm into the forearm base support 14 and then grips the first grip 15 and the second grip 16 with his left hand, so as to hold the brush cutter 1 in place. By supporting and, if desired, connecting the distal end stopper of the support band 13 attached to the body of the operator to the support band engagement member 22, a large part of the weight of the brush cutter 1 is supported by the support band 23. Work is performed while supporting the body of the worker through the body.

When the rotation speed of the engine 3 is increased by operating a throttle lever (not shown), the centrifugal clutch connects the output shaft of the engine and the transmission shaft 6, the transmission shaft 6 rotates, and this rotates the rotary blade at the tip of the operation tube. Rotate 13. In this state, the weeds and the like growing on the ground are cleared while the operation tube 2 is swung left and right by the left and right arms. The angle of the rotary blade 13 with respect to the operation tube 2 is preferably set so as to be substantially parallel to the ground to be mowed in order to smoothly perform the work.

In the portable power brush cutter of the present invention, when the ground to be worked is tilted in the left-right direction when viewed from the operator, the operation tube 2 is rotated about its axis, The rotary blade 13 can be guided so as to be parallel to the ground, and even when the ground is upward or downward in the front-back direction as seen from the operator, By extending or retracting the slide tube 5, the rotary blade 13 can be guided to be parallel to the ground to be mowed.

Not only that, but in the brush cutter of the present invention, the forearm for supporting the first grip 15 and the second grip 16 to be gripped by the operator, and the forearm base of the arm gripping the first grip 15 from the upper surface. Each of the base support members 14 is provided so as to extend laterally with respect to the operation tube 2, in other words, in the vertical direction, at a position substantially coincident with the axis of the operation tube. Therefore, the force to be applied to the operation tube via the grips 15 and 16 in order to swing the operation tube 2 in the left-right direction acts on the axis of the operation tube 2. In this type of brush cutter, its center of gravity G is located on the axis of the operation pipe, so that the force for swinging the operation pipe 2 to the left and right as described above causes the brush cutter 1 as a whole to move along the axis of the operation pipe 2. It does not generate a moment that tries to rotate it around its center.

In order for a worker to quickly mow a relatively narrow area, it is necessary to frequently oscillate the operation tube 2 back and forth. Then, the higher the speed of the swing, the stronger the force to be applied to the operation tube 2 in the lateral direction at the time of turning the swing. In the past, since the supporting means such as grips provided on the operation tube and gripped by the operator was often deviated upward with respect to the axis of the operation tube, the left and right sides as described above. If a strong lateral force is applied to the operation tube when it is swung, the moment that tries to rotate the entire brush cutter with respect to the axis of the operation tube inevitably acts, resulting in poor operability. Although there was a very bad problem, in the present invention, as described above, the operating force for swinging left and right acts on the axial center of the operating tube, so even if the operating force is increased, this causes the operating tube to move. No surrounding moment is generated.

Therefore, even in mowing work in a narrow space where the operating tube has to be oscillated relatively frequently to the left and right, the right and left oscillating force is effectively transmitted to the operating tube to stabilize the oscillating motion. At the same time, the operating tube will inadvertently rotate and the rotary blade will tilt, so that the situation where the rotary blade crashes into the ground rarely occurs.

Further, in the conventional example in which the grip or the like to be provided on the operation tube is deviated upward with respect to the axis of the operation tube, it is inevitable when a swinging force is applied in the left-right direction as described above. There is a sense of instability that the work must be carried out while exerting an extra force to cancel this because a moment that tries to rotate the operation tube acts on the operation tube. The feeling is also eliminated.

As described above, according to the portable power brush cutter of the present invention, when the weeding work of the field is carried out in actual farm work, the ridges and the banks, which occupy a large part, are occupied. For the first time, weeding of weeds in narrow ditches was possible with extremely good workability.

[Brief description of drawings]

FIG. 1 is an overall perspective view of an embodiment of the present invention.

FIG. 2 is a vertical sectional view of the above embodiment.

FIG. 3 is an enlarged sectional view taken along line III-III in FIG.

FIG. 4 is an enlarged sectional view taken along line IV-IV in FIG.

FIG. 5 is a diagram showing a usage state.

[Explanation of symbols]

 1 portable power brush cutter 2 operation pipe 3 engine 4 support pipe 5 slide pipe 6 transmission shaft 13 rotary blade 14 forearm base support 15 first grip 16 second grip

Claims (1)

[Scope of utility model registration request] 1. An operating pipe having a predetermined length, a rotary blade supported by a distal end of the operating pipe so as to be pivotable in the front-rear direction, an engine connected to a proximal end of the operating pipe, and an engine of the engine. A portable power brush cutter having a transmission shaft inserted into the operation pipe for transmitting a rotation output to the rotary blade, wherein the operation pipe is axially slidable on a support pipe on a proximal end side. And a rotary blade angle adjusting mechanism that can change the longitudinal pivot angle around the pivot of the rotary blade by sliding the slide tube relative to the support tube. While fixing a forearm base support tool having a substantially inverted U-shaped cross section that holds the upper surface of the forearm base of the operator to the right side of the base end of the support tube,
A first grip that projects in a substantially horizontal direction is provided on the right side approximately forward of the forearm length from the site where the forearm base support is provided, and a second grip that projects in a substantially horizontal direction is provided on the left side of the slide tube, and The portable power brush cutter, wherein the first grip is connected to the support tube by a screw method and has a function of fixing and fixing the slide tube to the support tube.