JP2017212903A - Portable work machine - Google Patents

Abstract

Provided is a portable working machine capable of adjusting a gap between an upper blade and a lower blade without using a tool such as a spanner. In a portable working machine configured to support an upper blade and a lower blade at a predetermined interval, elongated holes 21a and 22a are formed in the upper blade and the lower blade in a longitudinal direction, The clearance adjustment knob 36 is screwed into the guide bar 25 through the long holes. Also, a clamp is provided in which the gap adjusting knob 36 is pressed against the guide bar 25, and the lever 31 is manually rotated in the direction of the arrow 38b to pull the slide shaft 34 toward the arrow 39. Thus, the unclamped state is established by raising the hand as indicated by an arrow 38a. [Selection] Figure 3

Description

  The present invention relates to a portable working machine for pruning grass, garden trees, hedge branches and the like by sliding of two blades driven by an engine or a motor.

  For example, a hedge trimmer is known as a portable engine working machine that includes an engine as a drive source and processes an object to be processed by a blade driven by the engine. The hedge trimmer is also called a trimming machine, and a pair of blades (trimming blades) is set, and these blades are stacked in the vertical direction. On both sides orthogonal to the longitudinal direction of each blade, a large number of blade portions are arranged side by side, and either one of the opposing blades is moved in the longitudinal direction, or both blades are reciprocated in the longitudinal direction at opposite phases. By moving the workpiece, a workpiece such as a hedge is sandwiched between the blades and cut.

  In such a hedge trimmer, the pair of blades are arranged so as to protrude forward from the lower side of the main body housing that accommodates the engine, and are arranged in a vertical position with the crankshaft of the engine protruding downward. A gear case is fixed to the lower side, and the base ends of the pair of blades are supported by the gear case. A gear unit is accommodated in the gear case, and the rotational movement of the crankshaft of the engine is converted into a reciprocating motion by the gear unit and transmitted to the blade, and the upper blade and the lower blade reciprocate in opposite phases.

JP-A-2015-116131

  The blade of the hedge trimmer is supported by a bar-shaped guide bar extending in the longitudinal direction of the blade so as to be slidable in the front-rear direction. The upper blade and the lower blade are formed with elongated holes for passing the bolts, and are held in a slidable state with the bolts penetrating the elongated holes. FIG. 7 is a cross-sectional view showing the structure of a conventional blade holder 130. The upper blade 21 and the lower blade 22 are respectively formed with long holes 21a and 22a for allowing the bolts 136 to pass therethrough. The bolt 136 is a half-screw and flanged hexagon bolt, and the flange 136b is formed integrally with the head of the bolt. A male screw 136 a is formed on the outer peripheral portion of the bolt 136 on the tip side. On the other hand, the guide bar 125 is formed with a through hole in which a female screw 125a is formed. The operator tightens the bolt 136 against the guide bar 125 using a tool such as a spanner, and the flange 136b and the lower blade 22 when the upper blade 21 and the lower blade 22 are pressed against the guide bar 125 side. The gap t is adjusted to a predetermined value. When this gap t is adjusted appropriately, the nut 131 is attached to the tip of the bolt 136 and protrudes upward from the guide bar 125 and tightened. By tightening the nut 131, the relative rotation of the bolt 136 with respect to the guide bar 125 is prevented. Therefore, the distance between the lower surface of the guide bar 125 and the upper surface of the flange 136b is kept constant, and the space in which the blade slides (blade clamping) The size of the space can be kept constant.

  In the hedge trimmer of the type in which the upper blade 21 and the lower blade 22 are slid relative to each other to cut the workpiece, the cutting performance is changed by adjusting the gap between the upper blade 21 and the lower blade 22 with respect to the blade fixing member. It is desirable for a person to periodically adjust the distance between the upper blade 21 and the lower blade 22 so that a predetermined gap is maintained. When the gap adjustment is performed again, the nut 131 is once loosened with a spanner (not shown), the bolt 136 is rotated to adjust the gap t, and finally the nut 131 is tightened. When tightening the nut 131, it is necessary to tighten the nut 131 with another spanner while holding the head of the bolt 136 with a spanner and maintaining a non-rotatable state. As described above, when exchanging the upper blade 21 and the lower blade 22 and adjusting the gap, two tools, a tool for the bolt 136 (such as a spanner) and a tool for the nut 131 (such as a spanner), are necessary. Adjustment was not possible when there was no tool.

The present invention has been made in view of the above background, and an object of the present invention is to provide a portable working machine with improved workability when exchanging an upper blade and a lower blade and adjusting a gap.
Another object of the present invention is to realize a portable working machine that can adjust a gap between an upper blade and a lower blade without using a tool such as a spanner without using a tool.

The characteristics of representative ones of the inventions disclosed in the present application will be described as follows.
According to one aspect of the present invention, an upper blade and a lower blade, at least one of which is driven, and the upper blade and the lower blade are slidably supported in the longitudinal direction so as to slide with each other by a driving source such as an engine. In a portable working machine comprising a guide bar and a blade support member that supports the guide bar so that the upper blade and the lower blade are sandwiched so as to maintain a predetermined interval, the upper blade and the lower blade have a longitudinal length of the guide bar. An elongated hole is formed in the direction, and the blade support member passes through the elongated hole and is screwed into the guide bar. Further, a clamp having a lever portion and fixing the blade support member so as not to rotate with respect to the guide bar by rotating the lever portion is provided. With such a configuration, instead of fixing the blade support member with the nut, a clamp that fixes the blade support member by rotating the lever portion is used, so that the operator can easily fix the blade support member without tools. it can. The guide bar has a through hole formed with an internal thread, and the blade support member has a knob portion that can be operated by an operator on one end side and an external thread formed on the other end side. A male screw can be screwed onto the female screw. Thus, instead of the conventional bolt, the rotary member having the knob portion is used as the blade support member, so that the operator can easily adjust the blade support member without tools.

  According to another feature of the invention, the clamp has a connection portion connectable to the blade support member, and a pin portion fixed to the connection portion and serving as a rotation center of the lever portion, and the outer peripheral side of the pin portion of the lever portion. A cam is formed, and the blade support member is urged in the axial direction by the force of the cam by rotating the lever portion, and fixed to the guide bar to fix the blade support member. One end side of the blade support member is cylindrical, and a male screw is formed on the outer peripheral side, a female screw is formed on the inner peripheral side, and the female screw is screwed with a male screw part formed on the connection portion of the clamp. The lever part of the clamp has a longitudinal shape, and the outer diameter of the part covering the pin part is formed in a cam shape so that it varies depending on the rotation angle, so that the longitudinal direction of the lever part is parallel to the guide bar The blade support member is fixed when it is tilted down, and the blade support member is unfixed when it is raised perpendicularly.

  According to still another feature of the present invention, a plurality of long holes of the upper blade and the lower blade are provided in the longitudinal direction of the guide bar, and a plurality of clamps are arranged corresponding to the long holes. The direction of the longitudinal direction of the plurality of lever portions at the time of clamping may be arranged so as to be all the same direction. Further, since the clamp is provided with an adjusting screw for adjusting the pulling force due to the cam force, the strength of the clamping force can be adjusted. Furthermore, since the recess that can accommodate the lever portion is formed on the side of the guide bar where the clamp is located, the amount of protrusion of the lever portion from the upper end of the guide bar can be reduced.

According to the present invention, the clearance adjustment knob is screwed to the guide bar that guides the blade, and the clearance adjustment knob is fixed by the clamp, so that the clearance between the blades can be adjusted with fewer man-hours and less tools than before. Workability is greatly improved. When adjusting the clearance, lift the cam lever upward to loosen the fixing, then rotate the clearance adjustment knob screwed to the guide bar to adjust it to the desired clearance, and finally tilt the cam lever downward. Just fix it. Similarly, since the tool can be removed when removing the blade, the workability when exchanging the blade or sharpening the blade is greatly improved. In addition, when pruning work is done with branch teeth or other foreign objects caught between the upper and lower blades, the cam lever is released and the clearance adjustment knob increases the clearance between the blades. Can be removed. Furthermore, since the lever is in a position where it can be easily visually recognized by the worker who is working, the looseness of the cam lever can be easily recognized.
The above and other objects and novel features of the present invention will become apparent from the following description and drawings.

It is a top view of the hedge trimmer 1 which concerns on the Example of this invention. It is the elements on larger scale of the blade part 20 of FIG. 1, (1) is a top view, (2) is a bottom view. It is sectional drawing of the blade part 20 of FIG. 1, (1), (2) is sectional drawing of the AA part of FIG. 2, (3) is sectional drawing of the BB part of FIG. It is the elements on larger scale of the blade part which concerns on the modification of a 1st Example, (1) is a figure which shows the unclamp position which raised the cam lever 31, (2) shows the clamp position which lowered the cam lever 31 FIG. It is a partial top view which shows the guide bar cover 65 with which the blade part 60 of the hedge trimmer and the blade part 60 which concern on the 2nd Example of this invention are mounted | worn. FIG. 6 is a cross-sectional view showing a state after the guide bar cover 65 of FIG. 5 is attached, (1) is a cross-sectional view of the CC section of FIG. 5, and (2) is a cross-section of the DD section of FIG. FIG. It is a fragmentary sectional view which shows the structure of the blade holding | maintenance part 130 in the hedge trimmer of a prior art example.

  Embodiments of the present invention will be described below with reference to the drawings. In the following drawings, the same portions are denoted by the same reference numerals, and repeated description is omitted. Further, in this specification, description will be made assuming that the front, rear, left, right, and up and down directions are directions shown in the drawing.

  A hedge trimmer 1 shown in FIG. 1 is a portable engine working machine, also called a trimming machine, and performs a task of trimming a hedge, which is an object to be processed, uniformly. The hedge trimmer 1 has a blade portion 20 extending from the front lower side of the main body portion 2 to the front side. The main body 2 is provided with a main body frame 3 formed of a metal material such as a steel material or an aluminum alloy, and a housing (not shown in the figure) called an engine case is attached to the main body frame 3. A two-cycle engine (not shown) is accommodated in the housing. The engine is disposed horizontally in the housing, and a crankcase (not shown) is fixed to the main body frame 3. A carburetor 10 is provided on the right side of the engine, and a muffler (not shown) is provided on the left side. A fuel tank 12 is provided at the rear of the engine, and a fuel cap 13 is provided on the right side for closing a fuel filler opening (not shown) of the fuel tank. An air cleaner chamber cover 8 is provided in the vicinity of the vaporizer 10. A muffler (not shown) is covered with a muffler cover 9 and is guarded so that an operator does not touch the hot muffler. A top cover 7 is provided on the upper part of the housing, and a starter handle 19 for operating a recoil starter (not shown) is provided on the rear side of the top cover 7. A front handle 6 and a rear handle 4 are attached to the main body frame 3, and an operator performs work while holding the front handle 6 and the rear handle 4. A hand guard 16 is provided in front of the front handle 6 and in the vicinity of the base of the blade portion 20 to protect the operator's hand holding the front handle 6.

  The rear handle 4 is attached to the rear side of the main body frame 3 via a rotation shaft 17 parallel to the longitudinal direction (front-rear direction) of the hedge trimmer 1. The rear handle 4 is provided with a lock release button 15, and when the lock release button 15 is pressed, the rear handle 4 is rotated clockwise or counterclockwise with respect to the main body frame 3 with respect to the main body frame 3 around the rotation shaft 17. The fixing position of the rear handle 4 with respect to the main body frame 3 can be changed by rotating about 90 degrees at the maximum in the direction.

  The rear handle 4 is provided with a throttle lever (not shown), and the rotational speed of the engine can be adjusted by operating the throttle lever. The throttle lever can be operated only when the lock lever 5 is turned on (pressed state). An engine stop switch 14 for stopping the running engine is provided on the upper portion of the rear handle 4.

  A crankshaft (not shown) of the engine is arranged so as to extend in the vertical direction of the hedge trimmer 1, and a cylinder (not shown) that accommodates a piston (not shown) is arranged so as to extend forward from the crankshaft. . One end of the crankshaft protrudes downward from the engine, that is, toward the main body frame 3 side, and drives the upper blade 21 and the lower blade 22 via a centrifugal clutch and a power transmission mechanism (not shown). The power transmission mechanism is provided with a centrifugal clutch (not shown), and when the engine speed reaches a predetermined number of revolutions or more, the power is switched to the transmission state, and the upper blade 21 and the lower blade 22 are in reverse phase with respect to the main body portion 2 To slide.

  The blade unit 20 includes an upper blade 21, a lower blade 22, and a guide bar 25. The guide bar 25 is a rail-like metal member elongated in the longitudinal direction, and the upper blade 21 and the lower blade 22 are held by a plurality of blade holding portions 30 so as to be slidable in the front-rear direction. The upper blade 21 and the lower blade 22 are common parts that are rotationally symmetric about an axis A1 extending in the longitudinal direction. The upper blade 21 and the lower blade 22 are used as the upper blade 21 or the lower blade 22 by turning upside down. Can do. The upper blade 21 and the lower blade 22 are made of SK steel, which is a general blade material, and the length in the front-rear direction excluding the attachment portion (not shown) to the main body 2 is about 560 mm. However, the lengths of the upper blade 21 and the lower blade 22 are arbitrary, and various types of blades can be mounted. Further, one of the upper blade 21 and the lower blade 22 may be a fixed blade and only the other may slide. In FIG. 1, a part of the blade part 20 is omitted, so that only two blade holding parts 30 are shown, but in reality, the guide bar 25 is provided at a plurality of places, for example, five places. The intervals at which the blade holding portions 30 are arranged are preferably equal intervals, but may be arranged at arbitrary intervals.

  2 is a partially enlarged view of the blade portion 20 of FIG. 1, wherein (1) is a top view and (2) is a bottom view. A plurality of cutting edges are formed on both sides of the upper blade 21 and the lower blade 22 in the width direction, and when the hedge trimmer 1 is slid leftward or rightward by the shearing force between the cutting blades moving back and forth with respect to each other. An object ahead in the direction of travel can be cut. The upper blade 21 and the lower blade 22 have a large protruding amount on one side orthogonal to the longitudinal direction and a semi-circular tip, and a small protruding amount on the other side orthogonal to the longitudinal direction. The edge portion is formed by a cutting blade having a blade portion formed thereon.

  In this embodiment, instead of the conventional blade holding structure using the bolt 136 and the nut 131 shown in FIG. The clamp is a member for fixing or releasing the fixing of the blade support member (gap adjustment knob 36) by rotating the lever portion (cam lever 31). The clearance adjustment knob 36 is configured so that the operator can easily rotate it by hand. The upper blade 21 and the lower blade 22 are held below the guide bar 25 in a state where they are stacked one above the other. Slots 21a (described later in FIG. 3) and 22b are formed in the upper blade 21 and the lower blade 22, respectively, and a clearance adjustment knob 36, which is a blade support member, is inserted into these slots and tightened against the guide bar 25. I do. The width w in the left-right direction of the long holes 21a and 22a is slightly larger than the screw diameter of the gap adjusting knob 36, and the upper blade 21 and the lower blade 22 are not in contact with the gap adjusting knob 36 as much as possible, and are excellent in low friction. It is formed to the extent that it can slide. The length L in the front-rear direction of the long holes 21a, 22a is made larger than the stroke amount of the front blade 21 or the lower blade 22 moving back and forth, and the front end and the rear end of the long hole strike the gap adjusting knob 36 during the cutting operation. To the extent that it is not.

  In the conventional hedge trimmer shown in FIG. 7, the bolt 136 is used, but in this embodiment, the gap adjusting knob 36 that can be manually rotated by the operator is used instead of the bolt 136. The clearance adjustment knob 36 is cylindrical on the upper side, and a male screw is formed on the outer peripheral side of the cylindrical portion, and a female screw is formed on the inner peripheral side. In addition, a male screw portion is not formed on the outer peripheral side of the portion near the head (knob portion) of the gap adjustment knob 36, which is a so-called half screw type, and the outer diameter of the head of the gap adjustment knob 36 is substantially circular. In addition, a knob portion 36a having an anti-slip vertical groove formed on the outer peripheral surface is formed, and is configured to be operable by an operator. The cam lever 31 is rotated about 90 degrees around a rotation pin (pin portion) 33 serving as a rotation center so that the clearance adjustment knob 36 is biased or released from the guide bar 25 by the movement of the cam portion. I do. The cam lever 31 is an elongated plate-like member, and one end side is pivotally supported by a rotation pin 33 and the other end side is a free end 31a that can swing. Here, when the clamp is locked by tilting the longitudinal direction of the cam lever 31 parallel to the guide bar 25 so that the free end 31a side is positioned in front of the gap adjustment knob 36, the cam lever as viewed from the operator The longitudinal direction of 31 and the direction of the free end 31a are all the same. By aligning the direction of the cam lever 31 in this manner, the operator can visually confirm whether or not the cam lever 31 is correctly tightened (clamped state), and the cam lever 31 rotates to unclamp. The state can be recognized immediately.

  3 is a cross-sectional view of the blade portion 20, wherein (1) and (2) are cross-sections of the AA portion of FIG. 2, and (3) is a cross-section of the BB portion of FIG. The guide bar 25 is formed with a screw portion 25a for attaching a male screw-like screw portion 36c of the gap adjusting knob 36. The upper blade 21 and the lower blade 22 are disposed in the lower portion of the guide bar 25, and the clearance adjustment knob 36 is screwed to the screw portion 25a so as to pass through the long holes 21a and 22a of the upper blade 21 and the lower blade 22. Is done. The operator can easily screw the gap adjustment knob 36 by hand without using a special tool. On the inner peripheral side of the distal end side of the clearance adjustment knob 36, a female screw-like screw portion 36d that is screwed with a male screw-like screw portion 34a provided on the sliding shaft 34 that is a connecting portion is formed. The clamp according to this embodiment includes a cam lever 31, a cam portion 32, a rotation pin 33, a sliding shaft (connection portion) 34, and a receiving portion 35. The cam lever 31 is positioned so that the free end 31a side is upward as indicated by an arrow 38a, and the longitudinal direction of the cam lever 31 is raised so as to be orthogonal to the guide bar 25 so that it is aligned with the axial direction of the sliding shaft 34. As a result, the urging force between the cam portion 32 and the receiving portion 35 is substantially reduced or released. As a result, an unclamped state in which the pressing of the gap adjustment knob 36 against the guide bar 25 is released. When the operator rotates the gap adjustment knob 36 in this unclamped state, the gap adjustment knob 36 rotates relative to the screw portion 25a of the guide bar 25 and also relative to the screw portion 34a of the slide shaft 34. Can rotate. At this time, it is preferable to rotate the gap adjustment knob 36 while holding it with the other hand so that the cam lever 31 does not rotate.

  The cam portion 32 is formed in a cam shape so that the outer diameter of the portion covering the pin portion is not constant and the distance from the rotation center varies depending on the rotation angle, and the top of the cam mountain (the portion where the distance from the rotation center is the largest) Is positioned in a direction substantially orthogonal to the longitudinal direction of the cam lever 31. The receiving portion 35 is held in contact with the upper surface of the guide bar 25 and the cam portion 32. When the cam lever 31 is tilted downward as indicated by an arrow 38b in FIG. 3B and the free end 31a is directed forward, the gap between the cam portion 32 and the receiving portion 35 disappears and the cam lever 31 is pressed strongly. Therefore, the clearance adjustment knob 36 is pulled up with respect to the guide bar 25 by the pressing, and the clearance adjustment knob 36 is strongly urged toward the guide bar 25 and is brought into close contact therewith. This close contact prevents rotation of the clearance adjustment knob 36 around the rotation axis, and the clearance adjustment knob 36 is fixed, so that the clearance adjustment knob 36 is also loosened relative to the guide bar 25. Nor.

  As shown in FIG. 3 (3), the guide bar 25 has a U-shaped cross section, and a recess 25b that can accommodate the cam lever 31 is formed, so that a part of the cam lever 31 is formed in the recess 25b. The structure is designed to fit. The recess 25b is formed continuously in the longitudinal direction of the guide bar 25. With this structure, the amount of protrusion of the cam lever 31 from the upper end position of the guide bar 25 to the upper side can be kept small, and the gap adjustment knob 36 can be rotated around the rotation axis while the cam lever 31 is clamped. It can be effectively prevented from turning. This prevention of co-rotation has an effect that even if the cam lever 31 hits a branch tip or the like during the operation, it is difficult to move, so that the stability of the pruning operation can be further improved.

  When adjusting the gap between the upper blade 21 and the lower blade 22, after lifting the free end 31a of the cam lever 31 upward as shown by an arrow 38a as shown in FIG. The operator adjusts the gap adjustment knob 36 to an arbitrary gap by rotating the gap adjustment knob 36 left and right by hand or using a tool such as a pliers. Thereafter, as shown in FIG. 3 (2), the free end 31a of the cam lever 31 is tilted downward as indicated by an arrow 38b to fix the clearance adjustment knob 36. At this time, a pulling force in the direction of arrow 39 is applied to the gap adjustment knob 36 by the rotation of the cam lever 31 in the direction of arrow 38b, but no force in the rotational direction of the gap adjustment knob 36 is applied. Therefore, the clearance adjustment knob 36 can be fixed to the guide bar 25 in a stable state without changing the fixing position in the rotational direction. When replacing the upper blade 21 or the lower blade 22 or sharpening the blade, the free end 31a of the cam lever 31 is pulled upward to loosen the clearance adjustment knob 36 and remove it from the guide bar 25. At the same time, the sliding shaft 34 is removed from the clearance adjustment knob 36. The upper blade 21 and the lower blade 22 can be easily removed. When a branch is caught between the upper and lower blades and stalled, the gap between the upper blade 21 and the lower blade 22 can be widened by lifting the free end 31a of the cam lever 31 and loosening the clearance adjustment knob 36. Therefore, it is possible to easily remove the clogged branches.

  As described above, according to the structure of the present embodiment, adjustment of the gap between the blades, removal of the blades, and the like can be performed with fewer man-hours and less tools. In addition, if a plurality of clamps are arranged corresponding to the long holes 21a and 22a and the positions of the free ends 31a of the cam levers 31 of the respective clamps are aligned toward the front side, the cam lever 31 is loosened. When it is done, it is easily visible. Note that the direction of the free end 31a of the cam lever 31 in the clamped state is not limited to the direction from the rotation pin 33 to the front side, and may be unified, for example, to be rearward.

Next, a modification of the present embodiment will be described with reference to FIG. FIG. 4 is a partially enlarged view of a blade portion according to a modification of the first embodiment, (1) is a diagram showing an unclamping position where the free end 31a of the cam lever 31 is raised, and (2) is a lowering of the cam lever 31. FIG. A difference from the first embodiment shown in FIGS. 2 to 3 is that the cross-sectional shape perpendicular to the longitudinal direction of the guide bar 45 is not a U-shape but a rectangle. Other parts are the same as those in the first embodiment. The guide bar 45 is formed with a female screw-like through hole 45a for screwing the gap adjustment knob 36, and a step-shaped depression for mounting the metal receiving part 35. 45b is formed. A male screw provided on the outer peripheral side of the gap adjusting knob 36 is screwed with the through hole 45a of the guide bar 45, and a female screw-like screw part 36d of the gap adjusting knob 36 is screwed with the screw part 34a of the sliding shaft 34. To do. The receiving portion 35 is an annular metal member. When the cam crest 32 a of the cam portion 32 abuts, a tensile force is applied to the sliding shaft 34, and the receiving portion 35 and the cam inclined surface 32 b of the cam portion 32 abut. This releases the pulling force on the sliding shaft 34. When a pulling force is applied to the slide shaft 34, the clearance adjustment knob 36 is pressed against the guide bar 25 to prevent rotation around the rotation axis. Is fixed. If the receiving portion 35 is configured as a nut so as to be movable in the axial direction of the sliding shaft 34, the strength of the clamping force by the cam portion 32 can be adjusted. As in FIG. 4 (1), a gap 36b at the time of in close contact with the upper blade 21 and lower blade 22 to guide bar 45 side and t ₁ in the unclamp state, the clamped state as shown in FIG. 4 (2) gap 36b is _{t 2, and} becomes a relationship of t 1> _{t 2.} The feature of this modification is that the manufacturing cost of the guide bar 45 can be reduced and the wall thickness can be increased, so that the length of the through hole 45a can be increased. Further, the guide bar 45 can be easily manufactured by using the conventional guide bar 25 shown in FIG.

  Next, a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, the basic configuration is the same as that of the first embodiment, but it prevents a branch or the like from hitting the cam lever 31 or a dust or the like from entering the cam lever 31 during the operation. is there. FIG. 5 is a partial top view showing the blade portion 60 of the hedge trimmer according to the second embodiment and the guide bar cover 65 attached to the guide bar 55 of the blade portion 60. In this embodiment, the guide bar cover 65 made of synthetic resin can be mounted while sliding in the direction of the arrow 68 from the front side in the longitudinal direction of the guide bar 55. The guide bar 55 is formed with a groove (described later) continuous in the longitudinal direction for holding the guide bar cover 65.

  6 is a cross-sectional view showing a state after the guide bar cover 65 is attached in FIG. 5, (1) is a cross-sectional view of the CC section of FIG. 5, and (2) is a DD line of FIG. It is sectional drawing of a part. In (1), the basic structure is the same as that of the first embodiment, but since the guide bar cover 65 is attached, the free end 31a of the cam lever 31 may be moved in the direction opposite to the arrow 38b. Cannot move to unclamped state. Therefore, the risk of the cam lever 31 moving unexpectedly can be eliminated. In addition, since the guide bar cover 65 is attached, it is possible to suppress the cuttings and the like of branches and leaves from entering the vicinity of the cam lever 31. In (2), a continuous groove 56 that is continuous in the longitudinal direction is formed in the side wall portion of the concave recess in the guide bar 55. The cross-sectional shape of the guide bar cover 65 is a downward U-shape, and a rail portion 66 continuous in the longitudinal direction is formed on the side surface thereof. Thus, the guide bar cover 65 can be stably fixed by fitting the uneven portions formed on the guide bar 55 and the guide bar cover 65. Moreover, since the internal space of the cam lever 31 is sealed by the fitting of the concavo-convex portions, the cam lever 31 portion can be effectively protected. When the guide bar cover 65 and the guide bar 55 are formed with a claw portion and a groove portion (not shown) and the guide bar cover 65 is attached to a predetermined position at the rear end, the claw portion and the groove portion engage with each other. You may comprise so that 65 movement of the axial direction can be blocked | prevented. When removing the guide bar cover 65, the guide bar cover 65 is moved forward, that is, in the direction opposite to the arrow 68 in FIG.

  As mentioned above, although this invention was demonstrated based on the Example, this invention is not limited to the above-mentioned Example, A various change is possible within the range which does not deviate from the meaning. For example, in the above embodiment, the hedge trimmer using the engine as the drive source has been described. However, the drive source is not limited to the engine, and may be an electric motor or other drive source. In the above-described embodiment, the blade holding part 30 using a clamp is used for adjusting the distance between the upper blade 21 and the lower blade 22 of the hedge trimmer. However, not only the hedge trimmer but also the distance adjustment between two sliding members. The blade holding unit 30 using the clamp of this embodiment may be applied to a portable work machine that requires this mechanism.

DESCRIPTION OF SYMBOLS 1 Hedge trimmer 2 Main part 3 Main body frame 4 Rear handle 5 Lock lever 6 Front handle 7 Top cover 8 Air cleaner chamber cover 9 Muffler cover 10 Vaporizer 12 Fuel tank 13 Fuel cap 14 Engine stop switch 15 Lock release button 16 Hand guard 17 Rotation Shaft 19 Starter handle 20 Blade portion 21 Upper blade 21a Long hole 22 Lower blade 22a Long hole 25 Guide bar 25a Screw portion 25b Recess 30 Blade holding portion 31 Cam lever 31a Free end 32 Cam portion 32a Cam mountain 32b Cam slope 33 Rotating pin ( Pin part) 34 Sliding shaft (connection part)
34a Screw portion 35 Receiving portion 36 Clearance adjustment knob 36a Knob portion 36b Clearance 36c, 36d Screw portion 45 Guide bar 45a Through hole 45b Depression portion 55 Guide bar 56 Continuous groove 60 Blade portion 65 Guide bar cover 66 Rail portion 125 Guide bar 130 Blade Holding part 131 Nut 136 Bolt 136b Flange

Claims (8)

An upper blade and a lower blade, at least one of which is driven to slide relative to each other by a drive source;
A guide bar that slidably supports the upper blade and the lower blade in the longitudinal direction;
A blade support member that supports the guide bar so as to sandwich the upper blade and the lower blade so as to maintain a predetermined interval;
A portable work machine comprising:
The upper blade and the lower blade are formed with elongated holes in the longitudinal direction of the guide bar,
The blade support member is threaded into the guide bar through the elongated hole;
A portable working machine having a lever portion and provided with a clamp for rotating the lever portion so as to prevent the blade support member from rotating relative to the guide bar. A through hole in which an internal thread is formed in the guide bar is formed,
2. The portable device according to claim 1, wherein the blade support member has a knob portion that can be operated by an operator on one end side, a male screw is formed on the other end side, and is screwed into the female screw of the through hole. Working machine. The clamp has a connection portion connectable to the blade support member, and a pin portion fixed to the connection portion and serving as a rotation center of the lever portion,
A cam is formed on the outer peripheral side of the pin portion of the lever portion, and by rotating the lever portion, the blade support member is urged in the axial direction by the force of the cam, and is closely attached to the guide bar. The portable work machine according to claim 1, wherein the blade support member is fixed by being operated. One end side of the blade support member is cylindrical, a male screw is formed on the outer peripheral side, and a female screw is formed on the inner peripheral side,
The portable work machine according to claim 3, wherein the female screw is screwed with the male screw portion formed in the connection portion of the clamp. The lever portion of the clamp has a longitudinal shape, and is formed in a cam shape so that the outer diameter of the portion covering the pin portion varies depending on the rotation angle,
The blade support member is fixed when the lever portion is tilted so that the longitudinal direction thereof is parallel to the guide bar, and the blade support member is released when the lever portion is orthogonally moved. Item 5. The portable working machine according to Item 3 or 4. A plurality of the long holes of the upper blade and the lower blade are provided in the longitudinal direction of the guide bar,
A plurality of the clamps are arranged corresponding to the elongated holes,
The portable work machine according to claim 5, wherein the plurality of clamps at the time of clamping are arranged so that the longitudinal directions of the lever portions are the same.   The portable work machine according to any one of claims 3 to 6, wherein the clamp is provided with an adjustment screw for adjusting a pulling force due to the force of the cam.   The portable working machine according to any one of claims 1 to 7, wherein a concave portion capable of accommodating the lever portion is formed on a side of the guide bar where the clamp is located.

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