JP2014033660A - Portable power bush cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable power bush cutter enabling a right hand gripping a grip handle for a right hand with the back on a downside to operate a throttle lever, while imparting a function capable of selecting an extendable state and an unextendable state of an operation pipe to the grip handle for a right hand.SOLUTION: In a portable power bush cutter including an operation pipe 100, a grip handle 300 for a right hand and a rotary blade, capable of changing an angle to the operation pipe 100 of the rotary blade, the grip handle 300 for a right hand has a constitution including: a support shaft 310 provided fixedly on a first part 110; a grip member 320 rotatively operable around the support shaft 310 by being fitted to the support shaft 310, capable of selecting a relative movable state and a relative unmovable state between the first part 110 and a second part 120 by being rotated in a loosening direction or in a fastening direction; and throttle control means 380 supported on a tip part of the support shaft 310, capable of controlling a rotational frequency of a power source.

Description

  The present invention relates to a portable power brush cutter used for cutting weeds growing on the ground surface.

  For example, Patent Document 1 discloses a portable power brush cutter. The portable power brush cutter shown in the same document is a rotation that supports the rotation output of the engine mounted on the back frame at the tip of the operation tube through the rotation of the transmission shaft inserted through the flexible tube or operation tube. This is transmitted to the blade and the rotating blade is rotated. In addition, this portable power brush cutter can change the angle of the rotary blade with respect to the operation tube.

  The above-described portable power brush cutter employs the following configuration in order to change the angle of the rotary blade. The rotary blade support member that rotatably supports the rotary blade mounted on the rotary blade mounting shaft can swing back and forth around the horizontal axis with respect to the stay that extends obliquely downward from the tip of the operation tube. It is supported. The operation tube is divided into a proximal end portion and a distal end portion, and both are combined so as to be relatively movable in the axial direction. The transmission shaft is inserted into a rigid tube inserted into the operation tube or a flexible tube interposed between the distal end of the rigid tube and the rotary blade support member, and the distal end is coupled to the rotary blade mounting shaft. . The rigid tube is locked so as not to move in the axial direction relative to the proximal end portion of the operation tube. The proximal end portion and the distal end portion of the operation tube are formed by rotating a grip handle (for the right hand) provided to extend to the right end on the proximal end portion in the tightening direction, so that the threaded portion at the distal end is the distal end portion. By being pressed against the outer surface of the lens, it is fixed so as not to move in the axial direction, and can be moved in the axial direction by rotating the grip handle in the loosening direction. In addition, a left-hand grip handle extending to the left is fixedly provided at the distal end portion of the operation tube.

  Rotate the grip handle for the right hand in the loosening direction so that the proximal end portion and the distal end side portion of the operation tube can move relative to each other, and push the left hand grip handle forward so that the distal end side of the operation tube When the entire length of the operation tube is extended by moving the portion in the forward direction with respect to the proximal end portion, the flexible tube is drawn into the operation tube, and the rotary blade rotates so that the tip side thereof is lifted. When the total length of the operation tube is shortened by moving the distal end portion of the operation tube in the backward direction with respect to the proximal end portion so that the grip handle for the left hand is pulled forward, the flexible tube is Advancing from the tip, the rotary blade rotates so that the tip side is pushed down. The state in which the angle of the rotary blade with respect to the operation tube is adjusted to a desired angle in this way is fixed by rotating the grip handle for the right hand in the tightening direction. The operator supports the operation tube by gripping the left hand grip handle and the right hand grip handle as described above, and swings the operation tube left and right while rotating the rotary blade adjusted to a desired angle. Turn to perform mowing work.

  In this type of portable power brush cutter, as shown in FIG. 1 of Patent Document 1, the throttle lever for controlling the rotational speed of the engine is positioned near the right hand grip handle. It is usual to be provided in. In such a throttle lever arrangement, when gripping the grip handle for the right hand with the back of the hand up, the right thumb or index finger holding the grip handle reaches the throttle lever. Meanwhile, it is possible to change the rotation speed of the rotary blade by operating the throttle lever.

  By the way, in the portable power brush cutter of the type in which the engine is mounted on the back frame, as shown in Patent Document 2, the operation tube base is provided so that the operation tube can be supported more easily and the left and right swinging operation can be performed. A configuration in which an elbow rest member that supports the right forearm base (right elbow) is provided at the end may be employed. In this case, the grip handle for the right hand is held with the right elbow supported by the elbow rest member and the upper hand facing down by the right hand.

  In this case, the thumb or index finger of the right hand holding the right hand grip handle is positioned on the distal end side of the right hand grip handle. Then, if the throttle lever is provided on the operation tube as in Patent Document 1, the throttle lever cannot be operated while holding the right hand grip handle, and the left hand temporarily separated from the left hand grip handle. Because of this, the throttle lever must be operated. As a result, the rotation speed of the rotary blade cannot be changed quickly by operating the throttle lever, and it is maintained only by firmly grasping the left and right hand grip handles with the left and right hands. The operating stability of the operating tube is lost when the throttle lever is operated, and this deteriorates the operability of the brushing work performed by swinging the operating tube left and right.

Japanese Utility Model Publication No. 57-38974 JP 2004-222557 A

  The present invention has been conceived under the circumstances described above, and the right hand grip handle is provided with a function that allows the right hand grip handle to select a stretchable state or a non-stretchable state of the operation tube. It is an object of the present invention to provide a portable power brush cutter that allows the throttle lever to be operated with the right hand while gripping the back of the hand.

  In order to solve the above problems, the present invention employs the following technical means.

  That is, the portable power brush cutter provided by the present invention includes an operation tube in which a first portion on the proximal end side and a second portion on the distal end side are combined so as to be relatively movable in the axial direction, and the first portion. A grip handle for the right hand provided in the second part, which is provided and can be selected between a relatively movable state and a relatively unmovable state of the first part and the second part by rotating in a loosening direction or a tightening direction; A left grip handle for the left hand, and a rotary blade supported by the tip of the operation tube and rotated by a rotational output of a power source through a transmission shaft inserted through the operation tube, the first part, A portable type capable of changing an angle of the rotary blade with respect to the operation tube by moving the first portion and the second portion relative to each other and expanding and contracting the operation tube in a state in which relative movement with the second portion is possible. In the force brush cutter, the right-hand grip handle includes a support shaft fixedly provided on the first portion, and is rotatably fitted around the support shaft so as to be rotated around the support shaft. By rotating in the direction, a grip member capable of selecting a relative movable state and a relative non-movable state of the first part and the second part, and a tip of the support shaft are supported to rotate the power source. And a throttle control means capable of controlling the number.

  In a preferred embodiment, the second part has a proximal end inserted through the distal end side of the first part, and a slit that opens forward is formed at the distal end of the first part. When the grip member is rotated in the loosening direction, the width of the slit is expanded and the first portion and the second portion are in a state of being relatively movable. When the grip member is rotated in the tightening direction, the width of the slit is increased. The first portion and the second portion are reduced and become incapable of relative movement.

  In a preferred embodiment, the first portion is formed with a pair of ear pieces extending across the slit, the grip member is provided with a screw shaft, and the grip member is By rotating and rotating the screw shaft in the loosening direction or the tightening direction, the distance between the pair of ear pieces is changed, and the width of the slit is changed.

  In a preferred embodiment, the first portion is provided with an elbow rest member that receives and supports the operator's right elbow from below.

  In a preferred embodiment, the throttle control means includes a lever whose base end is rotatably supported by a support block provided at the distal end of the support shaft, and whose distal end extends toward the operation tube.

  In a preferred embodiment, the throttle control means further includes a stop button for stopping the power source.

  In a preferred embodiment, the power source is mounted on a shoulder frame, and the power source and the operation tube are connected by a flexible tube that inserts the transmission shaft.

  According to such a configuration, the throttle control means is located at a position where the right thumb or index finger reaches the right hand grip handle with the back of the hand held down. Therefore, while gripping the grip handle for the right hand with the back of the hand down, rotate the grip member in the loosening direction so that the first part and the second part of the operation tube are relatively moved, and extend and retract the operation tube. Both the operation of adjusting the angle of the rotary blade and the operation of the throttle control means are possible. This means that the angle adjustment operation of the rotary blade and the operation of the throttle control means can be performed in a state where the left hand grip handle is held by the left hand and the right hand grip handle is held by the right hand and the operation tube is stably supported. This means that the safety and operability of the mowing work are significantly increased.

  Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the drawings.

1 is an overall perspective view of a portable power brush cutter according to a first embodiment of the present invention. It is a partial expanded side view of the portable power brush cutter shown in FIG. It is a partial expanded horizontal sectional view of the portable power brush cutter shown in FIG. It is sectional drawing which follows the IV-IV line of FIG. It is a VV arrow line view of FIG. It is a figure similar to FIG. 3 which shows the portable power brush cutter which concerns on the 2nd Embodiment of this invention. It is sectional drawing which follows the VII-VII line of FIG.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings. 1 to 5 show a portable power brush cutter 10A according to the first embodiment.

  As shown in FIG. 1, the portable power brush cutter 10A is connected to a linearly extending operation tube 100 and a base end portion of the operation tube 100 via a flexible tube 220 such as a bellows tube, and has a back frame. 200 includes an engine 210 mounted as a power source and a rotary blade 170 attached to the distal end portion of the operation tube 100.

  The operation tube 100 includes a first portion 110 on the proximal end side and a second portion 120 on the distal end side, both of which are made of a lightweight metal such as aluminum. The first portion 110 has an inner diameter corresponding to the outer diameter of the second portion 120, and the first portion 110 and the second portion 120 are such that the proximal end side of the second portion 120 is pivoted from the distal end of the first portion 110. It is inserted and combined so that it can slide relative to the direction. The first portion 110 includes a right-hand grip handle 300 that extends toward the right side, and an elbow rest member 400 that supports the right elbow of the operator from below at the proximal end of the first portion 110. Is provided. A left hand grip handle 500 extending toward the left is provided at a predetermined portion in the longitudinal direction of the second portion 120.

  As shown in FIGS. 1 and 2, a tip 150 of the second portion 120 is provided with a stay 150 that extends obliquely downward and forward, and the stay 150 has a rotary blade support member 160 in a lateral direction. The shaft 151 is supported so as to be rotatable. The rotary blade support member 160 includes a rotary blade attachment shaft 161, and the rotary blade 170 is attached to the rotary blade attachment shaft 161.

  The rotary blade 170 is rotated by transmitting the rotation of the output shaft of the engine 210 via the transmission shaft 101. More specifically, a flexible tube 220 that connects the engine 210 and the proximal end of the operation tube 100 (first portion 110), and an axial relative movement with respect to the operation tube 100 that is inserted into the operation tube 100. A sheath member 102 that is impossiblely locked, and a transmission shaft 101 of a certain length inserted in series in a flexible tube 103 such as a bellows tube that connects the distal end of the sheath member 102 and the rotary blade support member 160. The proximal end is connected to the output shaft of the engine 210, and the distal end is connected to the rotary blade mounting shaft 161. At least a portion of the transmission shaft 101 inserted into the flexible tube 220 and the flexible tube 103 has flexibility. The sheath member 102 may be a rigid tube or a flexible tube. The flexible tube 220, the sheath member 102, and the flexible tube 103 basically do not expand and contract in the axial direction, and maintain a certain total length combining them. In addition, as described above, the flexible tube 220 or the sheath member 102 is locked to the first portion 110 of the operation tube 100 so as not to move in the axial direction.

  As shown in FIG. 3, the right-hand grip handle 300 is fixedly attached to the first portion 110 of the operation tube 100 and is fixedly fitted to the support shaft 310. A grip member 320 that can rotate around and a throttle control means 380 provided at the tip of the support shaft 310 are provided. The throttle control means 380 is supported so that the base end can swing on the front side of the support block 381 fixed to the tip of the support shaft 310, and is spaced from the grip member 320 toward the operation tube 100. It has the form of a throttle lever 382 extending in the direction. The grip member 320 is rotated in the loosening direction so that the first member 110 and the second member 120 can be moved relative to each other in the axial direction, and is rotated in the tightening direction so that the first member 110 and the second member 120 are rotated in the tightening direction. The member 120 has a function of making it impossible to move relative to the member 120. This will be specifically described below.

  As shown in FIGS. 3 and 4, a slit 111 extending in the axial direction of the first portion 110 is formed in the upper surface portion of the distal end portion of the first portion 110 of the operation tube 100. Further, a first ear piece 610 and a second ear piece 650 are formed on the upper surface of the tip of the first portion 110 so as to protrude upward with the slit 111 interposed therebetween. The first ear piece 610 and the second ear piece 650 have a predetermined thickness and are formed with through holes 620 and 660 having a common laterally extending axis, and the through holes 620 and 660 are formed. The formed site has a boss shape.

  The through hole 620 of the first ear piece 610 includes an outer round hole 621 and an inner screw hole 622, and the thread diameter of the screw hole 622 is the inner diameter of the round hole 621. It has become bigger. The through hole 660 of the second ear piece 650 is a round hole having an inner diameter corresponding to the thread valley diameter of the screw hole portion 622.

  The support shaft 310 is in the form of a metal pipe having a circular cross section as a whole, and has a small diameter portion 311 on the proximal end side and a large diameter portion 312 on the distal end side. The outer diameter of the small diameter portion 311 corresponds to the inner diameter of the round hole portion 621 of the first ear piece 610, and the small diameter portion 311 is inserted from the right into the through hole 660 of the second ear piece 650. In addition, it is inserted into the round hole 621 of the first ear piece 610 and is substantially fixed to the first portion 110 of the operation tube 100 by a set screw 611 screwed from the outer surface of the first ear piece 610. .

  The grip member 320 has a core shaft 330 made of a metal pipe, and a skin portion 340 made of rubber or synthetic resin provided so as to surround the core shaft 330. The core shaft 330 is continuous with a large diameter portion 331 having an inner diameter corresponding to the outer diameter of the large diameter portion 312 of the support shaft 310, and the outer diameter of the small diameter portion 311 of the support shaft 310. A small-diameter portion 332 having an inner diameter corresponding to the step 333 is formed at the boundary between the large-diameter portion 331 and the small-diameter portion 332. The small diameter portion 332 includes a round shaft portion 334 having an outer diameter corresponding to the inner diameter of the through hole 660 of the second ear piece 650, and a screw shaft portion 335 that is screwed into the screw hole portion 622 of the first ear piece 610. Have The grip member 320 is inserted into the through hole 660 of the second ear piece 650 with the small-diameter portion 332 of the core shaft 330 in a state of being fitted to the support shaft 310, and the screw shaft portion 335 is inserted into the first ear piece. The screw holes 622 of the through-holes 620 of the 610 are screwed together, and are screwed and combined until the stepped portion 333 of the core shaft 330 contacts the outer surface of the second ear piece 650. Note that a washer 350 is preferably interposed between the stepped portion 333 and the outer surface of the second ear piece 650. When the grip member 320 is rotated in the tightening direction (usually clockwise), the core shaft 330 is rotated while its stepped portion 333 contacts the outer surface of the second ear piece 650 and movement in the axial direction is prevented. Therefore, when the screw shaft portion 335 is screwed through the screw hole portion 622, the first ear piece 610 is attracted to the second ear piece 650, and the width of the slit 111 is reduced. The state where the part 110 tightens the second part 120 and the relative movement between the first part 110 and the second part 120 is impossible is selected. When the grip member 320 is rotated in the loosening direction (usually counterclockwise), the first ear piece 610 and the second ear piece 650 are moved by the reverse action of the screw shaft portion 335 and the screw hole portion 622. A state in which the interval is widened and the width of the slit 111 is widened, the tightening state of the second portion 120 by the first portion 110 of the operation tube 100 is released, and the first portion 110 and the second portion 120 can be relatively moved. Is selected.

  As described above, the throttle lever 382 is provided on the large-diameter portion 312 at the tip of the support shaft 310 via the support block 381. When the throttle lever 382 is rotated in the direction P in FIG. 3, the throttle cable 384 is pulled, and the rotational speed of the engine 210 increases. Since the throttle cable 384 is always elastically pulled toward the engine side by a spring (not shown) provided on the engine side, the throttle lever 382 is positioned on the Q direction side in the rotation range in the normal state. . In FIG. 3, reference numeral 383 denotes a stop button disposed on the rear side surface of the support block 381. By pressing the stop button 383, the engine 210 is urgently stopped. A cable (not shown) linked to the throttle cable 384 and the stop button 383 passes through the inside of the support shaft 310 and is drawn from its end (left end), and is drawn around the engine 210.

  Next, the operation of the portable power brush cutter 10A configured as described above will be described.

  The operator carries the back frame 200 on which the engine 210 is mounted, holds the left hand grip handle 500 with the left hand, supports the right elbow on the elbow rest member 400, and uses the right hand with the instep down for the right hand. The operation handle 100 is supported by gripping the grip handle 300. Since the operation tube 100 is supported by both hands of the operator, the operation tube 100 can be stably shaken to perform the mowing work. The thumb or forefinger of the right hand with the instep down is positioned on the right side (tip side) of the grip handle 300 for the right hand, and the engine is operated by operating the throttle lever 382 with the index finger while holding the grip handle 300 for the right hand. The number of rotations 210 (the number of rotations of the rotary blade 170) can be controlled, and the engine 210 can be stopped in an emergency by pressing the stop button 383 with the thumb.

  By rotating the grip member 320 while holding the grip handle 300 for the right hand, as described above, the first portion 110 and the second portion 120 of the operation tube 100 are relatively incapable of relative movement and can be relatively moved. Can be easily selected.

  In a state where the first portion 110 and the second portion 120 of the operation tube 100 are relatively movable, for example, when the entire length of the operation tube 100 is extended by pushing the left hand grip handle 500 forward, the flexible tube 103. Accordingly, the rotary blade support member 160 is rotated so that the front of the rotary blade 170 is lifted around the horizontal axis 151 as indicated by a virtual line in FIG. Move. Further, when the total length of the operation tube 100 is shortened by pulling the grip handle 500 for the left hand backward, the flexible tube 103 extends from the tip of the operation tube 100 correspondingly, and as shown by a solid line in FIG. The rotary blade support member 160 rotates about the horizontal axis 151 so that the front of the rotary blade 170 is lowered. Thus, after adjusting the angle of the rotary blade 170 with respect to the operation tube 100 as desired, the grip member 320 is rotated in the tightening direction so that the first portion 110 and the second portion 120 cannot move relative to each other. By selecting, the angle of the rotary blade 170 after adjustment is maintained.

  Thus, according to the portable power brush cutter 10A configured as described above, the angle of the rotary blade 170 is adjusted, the rotational speed of the engine 210 is controlled by operating the throttle lever 382 (throttle control means 380), and the stop button 383 is pressed. All operations such as emergency stop of the engine 210 by the above can be performed in a state where the left hand grip handle 500 and the right hand grip handle 300 are held with both hands and the operation tube 100 is stably supported.

  6 and 7 show a portable power brush cutter 10B according to the second embodiment.

  As shown in FIGS. 6 and 7, a slit 111 extending in the axial direction of the first portion 110 is formed in the upper surface portion of the distal end portion of the first portion 110 of the operation tube 100, and the first portion 110 is formed in the first portion 110. On the upper surface of the tip of the portion 110, the first ear piece 610 and the second ear piece 650 are formed so as to protrude upward with the slit 111 interposed therebetween. 610 and the second ear piece 650 have a predetermined thickness and are formed with through holes 620 and 660 having a common laterally extending axis, and the portions where the through holes 620 and 660 are formed are The boss-like shape, the support shaft 310 being fixedly supported in the through holes 620 and 660, and the throttle lever 382 swinging to the tip (right end) of the support shaft 310 via the support block 381. Capable supported, that the said supporting block 381 also stop button 383 is provided is similar to the first embodiment. In addition, by rotating the grip member 320 fitted to the support shaft 310 in the loosening direction or the tightening direction, the width of the slit 111 is expanded and reduced, and the relative movement between the first portion 110 and the second portion 120 of the operation tube 100 is performed. Although it is the same as that of 1st Embodiment also about the point which can select a possible state and a relative immovable state, the specific structures differ. This will be described below.

  The through hole 620 of the first ear piece 610 and the through hole 660 of the second ear piece 650 are round holes having the same inner diameter that is slightly larger than the outer diameter of the small diameter portion 311 of the support shaft 310 described later. The support shaft 310 has a metal pipe shape with a circular cross section as a whole, and has a proximal-side small-diameter portion 311 and a distal-end-side large-diameter portion 312, and the small-diameter portion 311 has through holes 620 and 660. And is substantially fixed to the first portion 110 of the operation tube 100 by a set screw 612 screwed from the outer surface of the second ear piece 650.

  The grip member 320 has a core shaft 330 made of a metal pipe, and a skin portion 340 made of rubber or synthetic resin provided so as to surround the core shaft 330. However, in this embodiment, the skin portion 340 of the grip member 320 is provided with a rubber or synthetic resin skin portion 341 provided so as to surround an inner portion of the large-diameter portion 312 of the support shaft 310 from the support block 381. A grip is formed in cooperation with the device. A screw shaft portion 336 having an axial through-hole 337 that is externally fitted to the small-diameter portion 311 of the support shaft 310 is integrally formed on the proximal end side (left end side) of the core shaft 330. Is provided. The screw shaft portion 336 is screwed into a screw hole 711 of a nut member 710 positioned outside the second ear piece 650, and the nut member 710 is a hole 721 that fits into the left end of the support shaft 310. A clamping force transmitting member having a U-shaped cross section comprising a pressing piece 720 that is positioned on the outer surface of the first ear piece 610 and a connecting piece 730 that rigidly connects the nut member 710 and the pressing piece 720. 700. A washer 350 is preferably interposed between the tip of the screw shaft portion 336 and the outer surface of the second ear piece 650. When the grip member 320 is rotated in the tightening direction (usually clockwise), the screw shaft portion 336 rotates with its tip substantially contacting the outer surface of the second ear piece 650, and this screw shaft portion 336. Is forcibly moved to the right in FIG. This moving force is transmitted to the pressing piece 720 via the connecting piece 730, and the pressing piece 720 presses the first ear piece 610, thereby causing the first ear piece 610 to approach the second ear piece 650. As a result, the width of the slit 111 is reduced, and the first portion 110 of the operation tube 100 tightens the second portion 120 so that the relative movement between the first portion 110 and the second portion 120 is impossible. . When the grip member 320 is rotated in the loosening direction (usually counterclockwise), the distance between the first ear piece 610 and the second ear piece 650 due to the reverse action of the screw shaft portion 336 and the nut member 710 described above. Is widened, the width of the slit 111 is widened, the tightening state of the second portion 120 by the first portion 110 of the operation tube 100 is released, and the first portion 110 and the second portion 120 can be relatively moved. Selected.

  Also in the portable power brush cutter 10B configured as described above, the angle adjustment of the rotary blade 170 and the throttle lever 382 (throttle control means 380) are performed by the same operation as the portable power brush cutter 10A described with reference to FIGS. All the operations such as the control of the rotation speed of the engine 210 by the operation of) and the emergency stop of the engine 210 by pressing the stop button 383 are carried out by holding the grip handle 500 for the left hand and the grip handle 300 for the right hand with both hands. It can carry out in the state which supported 100 stably.

  Of course, the scope of the present invention is not limited to the above-described embodiments, and all modifications within the scope of the matters described in the claims are included in the scope of the present invention.

  In particular, the configuration for selecting the relative movement impossible state and the relative movable state between the first portion and the second portion of the operation tube by rotating the grip member of the right-hand grip handle will be described for each embodiment. The configuration is not limited to the above.

10A, 10B Portable power brush cutter 100 Operation tube 101 Transmission shaft 102 Sheath member 103 Flexible tube 110 First portion 111 Slit 120 Second portion 160 Rotary blade support member 170 Rotary blade 200 Back frame 210 Engine (Power source)
220 flexible tube 300 right hand grip handle 310 support shaft 320 grip member 335 screw shaft portion 380 throttle control means 381 support block 382 throttle lever 383 stop button 400 elbow rest member 500 left hand grip handle 610 first ear piece 650 second Earpiece

Claims (7)

The operation tube in which the first portion on the proximal end side and the second portion on the distal end side are combined so as to be relatively movable in the axial direction, and provided in the first portion, and by rotating in the loosening direction or the tightening direction, A right-hand grip handle capable of selecting a relatively movable state and a relatively unmovable state between the first portion and the second portion, a left-hand grip handle provided in the second portion, and a tip supported by the operation tube And a rotary blade that is rotated by a rotational output of a power source through a transmission shaft that is inserted through the operation tube, and the first part is in a state in which the first part and the second part are relatively movable. In a portable power brush cutter that can change the angle of the rotary blade with respect to the operation tube by relatively moving the second portion and the operation tube,
The grip handle for the right hand is fixed to the first portion, and is supported by the support shaft so as to be rotated around the support shaft, and is rotated in a loosening direction or a tightening direction. Thus, the grip member capable of selecting the relatively movable state and the relatively unmovable state of the first part and the second part, and the tip of the support shaft are supported, and the rotational speed of the power source can be controlled. A portable power brush cutter comprising: a throttle control means.   The second part has a proximal end inserted through the distal end side of the first part, and a slit that opens forward is formed at the distal end of the first part. And the first part and the second part are movable relative to each other. When the grip member is rotated in the tightening direction, the slit width is reduced and the first part is reduced. The portable power brush cutter according to claim 1, wherein the portion and the second portion are incapable of relative movement.   The first portion is formed with a pair of ear pieces extending across the slit, and the grip member is provided with a screw shaft, and the screw member is rotated to rotate the screw shaft. The portable power brush cutter according to claim 2, wherein the distance between the pair of ear pieces is changed by rotating the screw in a loosening direction or a tightening direction, whereby the width of the slit is changed.   The portable power brush cutter according to any one of claims 1 to 3, wherein the first portion is provided with an elbow rest member that receives and supports an operator's right elbow from below.   5. The throttle control means according to claim 1, further comprising a lever having a base end rotatably supported by a support block provided at a tip end of the support shaft, and a tip end extending toward the operation tube. Portable power brush cutter.   The portable power brush cutter according to claim 5, wherein the throttle control means further includes a stop button for stopping the power source.   The said power source is mounted in the back frame, The said power source and the said operation pipe | tube are connected by the flexible pipe | tube which inserts the said transmission shaft. Portable power brush cutter.

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