JP2017212904A - Portable work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable work machine in which a swinging mechanism in the left and right direction is added to a handle rotating around a horizontal rotation axis with respect to a main body part.SOLUTION: In a portable work machine connected to a rear side of a main body part for housing a driving source and having a rear handle part (30) provided with a throttle lever (34) capable of adjusting the output of the driving source, the rear handle portion 30 is rotatable around the horizontal rotation axis B1 with respect to the main body part, and further in the rear side of the central point 69c of the horizontal rotation axis B1, it is also rotatable around an orthogonal pivot axis C1. Rotation around the horizontal rotation axis B1 and the orthogonal rotation axis C1 is possible by operating one lock operation lever 50 as shown by an arrow 68.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a hand-held portable working machine having a handle behind the main body.

  In a portable work machine that can be driven by a drive source such as an engine or an electric motor, a handle connected so as to protrude from the main body to one side is provided, and the operator holds the main body by holding the handle. Work while. There is known a portable working machine in which the handle is connected to a main body by a pivot shaft that is pivotable. For example, a hedge trimmer that cuts the upper blade and the lower blade relative to each other from the main body toward the front side is used for pruning hedges, so various operations can be performed depending on the position to cut and the worker's posture. Used in posture. For this reason, as shown in Patent Document 1, the rear handle can be rotated around an axis (horizontal rotation axis) coinciding with the longitudinal direction of the upper blade and the lower blade. A space is provided to prevent the worker's hands from hitting the hedge. When the handle is rotated, a structure is employed in which the cutting blade does not operate in order to prevent unintended cutting away.

JP 2010-138814 A

  The technique disclosed in Patent Document 1 has good work efficiency when pruning a horizontal hedge, but when pruning a vertical hedge, the hedge is working because the rear handle is near the pruning surface of the hedge. There is a risk that it will hit the user's hand, and further improvement of workability by expanding the movable range of the rear handle has been desired.

The present invention has been made in view of the above background, and an object thereof is to provide a portable working machine in which a swing mechanism in the left-right direction is added to a handle that rotates about a horizontal rotation axis with respect to a main body portion. There is to do.
Another object of the present invention is to provide a portable work machine that can perform the rotation of the handle about the horizontal rotation axis and the swinging operation in the left-right direction with a single button.
Still another object of the present invention is to provide a portable working machine that prevents the operation of a cutting blade when a turning or swinging operation of a handle is allowed.

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, a drive source such as an engine or an electric motor, a housing that houses the drive source, a work tool that is connected to the housing and reciprocates in the front-rear direction, and an output of the drive source can be adjusted. And a handle that is connected to the housing and extends in the front-rear direction. The handle is in a state in which the operation plane of the operation lever is substantially orthogonal to the reciprocating surface of the work implement. In this case, the operation plane can be swung in the left-right direction, and can be fixed at a plurality of positions in the left-right direction. In addition, the swing mechanism is realized by an orthogonal rotation shaft in order to swing the handle in the left-right direction, and the orthogonal rotation shaft is provided on the rear side of the connection point between the housing and the handle. The handle and the housing are connected by a turning mechanism that can turn around a horizontal turning shaft extending in a substantially horizontal direction, and the orthogonal turning shaft is disposed closer to the handle than the center point of the horizontal turning shaft.

  According to another feature of the present invention, the first lock member that switches between a released state and a fixed state of rotation about the orthogonal rotation axis of the handle is provided, the first lock member has an operation portion, and an operator handles the handle. An operation unit is provided at a position where the operation can be performed in a state where the handle is held. The handle can be fixed at a plurality of positions around the orthogonal rotation axis and the horizontal rotation axis. First and second lock members that switch between a released state and a fixed state of rotation about the horizontal rotation axis and the orthogonal rotation axis of the handle are provided, and these can be operated by a common operation unit. Depending on the pushing amount of the operation unit, the unlocking of the handle about the orthogonal rotation axis and the fixing release of the horizontal rotation axis are switched. Furthermore, when operating the operation lever, a restriction member is provided that makes the operation portions of the first lock member and the second lock member immovable.

  According to the present invention, the handle portion of the portable work machine can be rotated with respect to the housing by the horizontal rotation shaft, and further, can be rotated by the orthogonal rotation shaft on the rear side of the center point of the horizontal rotation shaft. Since it can be fixed at a plurality of positions on the horizontal rotation axis and the orthogonal rotation axis, it is possible to set an appropriate handle position in any work posture. In addition, since the rotation operation of the handle portion by the horizontal rotation shaft and the orthogonal rotation shaft can be unlocked by the operation of one operation portion, the change of the handle position is easy. Furthermore, when either or both of the first lock member and the second lock member are operated by the unlocking operation portion of the handle portion, the throttle lever (operation lever) of the drive source is operated. Therefore, it is possible to prevent malfunction of work equipment such as a cutting blade.

It is a top view of the hedge trimmer 1 which concerns on a present Example. It is a side view of the hedge trimmer 1 which concerns on a present Example. FIG. 3 is a view (partially sectional view) showing an internal structure of a rear handle portion 30 of FIG. 2. It is a fragmentary sectional view for demonstrating the motion of the 1st rotating shaft of FIG. 3, and a 2nd rotating shaft. FIG. 4 is a cross-sectional view of the sleeve 40 alone in FIG. 3, (1) is a cross-sectional view in the first cross section, and (2) is a second cross section perpendicular to the first cross section (EE portion in FIG. 3). FIG. FIG. 4 is a partially enlarged view of the vicinity of a first rotation axis and a second rotation axis in FIG. 3. It is the elements on larger scale near the 1st rotation axis and the 2nd rotation axis of the hedge trimmer concerning the 2nd example of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings by using a hedge trimmer 1 as an example of a portable work machine. 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.

 FIG. 1 is a top view of a hedge trimmer 1 according to the present embodiment. The hedge trimmer 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 includes a main body portion 2 provided with an engine, a blade portion 20 extending from the front lower side of the main body portion 2 to the front side, a rear handle portion 30 extending rearward of the main body portion 2, and a front side of the main body portion 2. It is mainly constituted by a front handle 5 extending upward. 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. The outer shell of the main body is mainly composed of a cylinder cover 4 (described later in FIG. 2), a top cover (fan cover) 7 provided on the upper portion of the cylinder cover 4, and a muffler cover 9 that covers the muffler portion. A two-cycle engine (not shown) is arranged horizontally inside the main body, a piston (not shown) is arranged so as to extend in the front-rear direction, 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 recoil starter (not shown) is provided on the inner side of the top cover 7 mounted on the upper side of the cylinder cover 4, and a starter handle 19 for operating the recoil starter is provided on the rear side of the top cover 7. A hand guard 16 is provided on the front side of the front handle 5 and in the vicinity of the root of the blade portion 20 as a work tool to protect the operator's hands from scattering of grass and pebbles that have been cut off. An operator performs a trimming operation while holding the front handle 5 and the rear handle 30 and operates a throttle lever (to be described later) with a hand (usually a right hand) holding the rear handle 30.

  The rear handle portion 30 is disposed so as to extend to the rear side of the main body frame 3 and is used for holding the hedge trimmer 1 together with the front handle 5. The rear handle portion 30 is connected to the main body portion 2 via a horizontal rotation shaft, which will be described later, and the end portion of the attachment portion 3a of the main body frame 3 serves as a connection point. The rear handle portion 30 is formed in a left and right divided manner on a vertical plane D1 including the longitudinal direction (front-rear direction) of the hedge trimmer 1 at the handle position in the state of FIG. An engine stop switch 14 for stopping the engine by stopping the supply of high-voltage current to the ignition plug of the engine is provided in front of the rear handle 30.

  The rear handle portion 30 is provided with a lock release lever 50. When the lock release lever 50 is pressed, the rear handle portion 30 is rotated clockwise or counterclockwise with respect to the main body frame 3 around a first rotation shaft described later. It can be rotated approximately 45 degrees or 90 degrees in the direction. The rear handle portion 30 of the present embodiment is further provided with a second rotation shaft (having a center point on the rear side of the center point of the first rotation shaft and arranged to be orthogonal to the first rotation shaft ( It is configured to be able to swing around the orthogonal rotation axis. As described above, the rear handle portion 30 is configured to be rotatable or swingable with respect to the main body portion 2 on the basis of the two rotation axes, so that the position of the rear handle portion 30 with respect to the main body portion 2 can be set in various fixed positions. Can be changed.

  FIG. 2 is a left side view of the hedge trimmer 1 according to the present embodiment. The handle housing 31 of the rear handle portion 30 has a substantially D-shape that is lateral when viewed from the side, and the upper cylindrical portion serves as a grip portion 30a that is gripped by an operator. The handle housing 31 is composed of a left and right divided type by a molded product of synthetic resin, and a divided surface is fixed by screws 49a to 49d. A throttle lever (operating lever) 34 is provided below the grip portion 30a so that the engine output can be adjusted by operating the throttle lever 34. Here, the operation plane of the throttle lever 34 is a vertical plane including front and rear and up and down directions when the rear handle 30 is positioned as shown in FIG. The throttle lever 34 can be operated only when the lock lever 37 is pushed in (on state), and the rotational speed of the engine can be increased or decreased by the pulling amount of the throttle lever 34. A part of the unlocking lever 50 protrudes from the opening of the handle housing 31 so that it can be operated with the thumb while gripping the grip portion 30a.

  The crankshaft (not shown) of the engine is arranged so as to extend in the vertical direction of the hedge trimmer 1, and one end of the crankshaft protrudes downward from the engine, that is, toward the main body frame 3 side. 11 to drive the blade 23. The blade 23 is guided by a blade guide 24 and is composed of an upper blade 23a and a lower blade 23b, which are common parts, and includes a sliding surface (reciprocating surface) including a longitudinal central axis A1 and serving as a cutting surface in a horizontal direction. It is arranged to become. The blade 23 can be used as the upper blade 23a when the sliding surface is arranged on the lower side, and the longitudinal central axis A1 can be used as the lower blade 23b when the sliding surface is turned upside down and arranged on the upper side. Constructed rotationally symmetric with respect to the reference. The power transmission mechanism unit 11 is provided with a centrifugal clutch (not shown). When the engine speed exceeds a predetermined number of revolutions, the power is switched to the transmission state, and the upper blade 23a and the lower blade 23b are in reverse phase with respect to the main body unit 2. Slide back and forth. Thus, by reciprocating the upper blade 23a and the lower blade 23b, the material to be cut located between the upper blade 23a and the lower blade 23b can be cut off.

  The front handle 5 is fixed to the front side of the main body frame 3 with bolts, and its shape is substantially U-shaped when viewed from the whole, and is provided so as to be separated from the hand guard 16 by a predetermined distance. The shape of the hand guard 16 is substantially trapezoidal and is attached so as to protrude obliquely forward from the main body frame 3. The rear handle portion 30 is pivotally supported by the mounting portion 3a at the rear end of the main body frame 3, and is configured to be rotatable by a predetermined angle by the first rotation axis B1. Here, the first rotation axis B <b> 1 is a horizontal rotation axis disposed so as to extend in the horizontal direction, and is disposed so as to be parallel to the longitudinal center axis A <b> 1 of the blade 23. In addition, when the first rotation axis B1 is not horizontal, when viewed from the side as shown in FIG. 2, the rear side of the axis of the first rotation axis B1 is slightly upward or slightly downward. You may arrange | position so that it may incline. However, it is preferable that the inclination in that case is slight and the first rotation axis B1 is in a range that can be said to be substantially horizontal.

  FIG. 3 is a view showing the internal structure of the rear handle portion 30 of the hedge trimmer 1, and is a side view (partially sectional view) showing a state in which the left housing 31b is removed. The handle housing 31 is provided on the rear side of the substantially cylindrical mounting portion 3a at the rear end of the main body frame 3, and is configured to be rotatable about the first rotation axis B1. In order to enable this rotation, the main body frame 3 and the rear handle portion 30 are pivotally supported via a cylindrical sleeve 40. The sleeve 40 is fixed to the handle housing 31 side, has a cylindrical shape that allows horizontal rotation, and is held in a slidable state by the mounting portion 3 a of the main body frame 3. On the other hand, a second rotation shaft 42 extending in a direction perpendicular to the horizontal rotation axis B1 is provided at a position 180 degrees away from the outer peripheral portion on the rear side of the sleeve 40. The handle housing 31 is held so as to be rotatable about a second rotation axis 42 by a predetermined angle around the second rotation axis C1. Here, the first rotation axis B1 is arranged to be in the horizontal direction, and the second rotation axis C1 is arranged to be orthogonal to the first rotation axis B1. Further, the first sliding portion 69a around the first rotation axis B1 as viewed in the front-rear direction is disposed on the front side (side closer to the main body 2) of the second sliding portion 69b around the second rotation axis C1. It is characterized by being. In other words, the axial center point 69c of the first sliding part 69a is positioned on the front side (main body part 2 side) of the second rotation axis C1.

  The first rotation axis B1 is determined by the substantially cylindrical sleeve 40. The sleeve 40 is held by a cylindrical inner wall portion of the mounting portion 3a, and can be slid by a predetermined angle in the rotation direction around the first rotation axis B1. Further, the sleeve 40 is configured with a second rotation shaft 42 so as to be swingable in the left-right direction around the second rotation axis C1. The second rotation axis C1 is the rear end side of the sleeve 40, and two second rotation shafts 42 that protrude radially outward are formed at two locations on the outer peripheral side. The second rotation shaft 42 protrudes from a position 180 degrees away from the outer peripheral portion of the sleeve 40, and is configured such that these axial centers coincide with the second rotation axis C1. The second rotating shaft 42 is slidably held by a shaft fixing boss of the rear handle portion 30, and the rear handle portion 30 is also in the second rotating axis C1 orthogonal to the first rotating axis B1. It is configured to be rotatable. As described above, by being configured to be rotatable not only on the first rotation axis B1 but also on the second rotation axis C1, the attachment position of the rear handle portion 30 with respect to the main body 2 is substantially left and right. It can be changed to swing, and can be changed to various other states.

  The allowable rotation angle of the first rotation axis B1 may be within ± 90 degrees on one side from the state of FIGS. 1 and 2, for example, every 45 degrees clockwise from the state of FIG. 1 when viewed from the rear. Rotation can be made every 45 degrees counterclockwise. Similarly, the rotation angle of the second rotation axis C1 may be about ± 30 degrees in the left-right direction from the state of FIG. Here, the rear handle portion 30 can be fixed at a total of m × n locations of a plurality of locations m in the rotation range of the first rotation axis B1 and a plurality of locations n in the rotation range of the second rotation axis C1. .

  The throttle lever 34 adjusts the supply amount of the mixed gas to the engine. The throttle lever 34 is formed so that the rear side can swing about the front swing shaft 35. The throttle lever 34 is formed with a locking portion 34c that locks the end of the throttle wire 39 so as to protrude from the main body portion, and a swing piece 34d that disables the movement of the first lock member 50. When the operator pulls the throttle lever 34 with the finger in the direction of the arrow 67, the throttle wire 39 is pulled by the locking portion 34c, and the throttle of the carburetor (not shown) is operated. A lock lever 37 projects above the handle housing 31. The lock lever 37 has a swing shaft 38 on the front side, and has a protruding portion 37 a that protrudes below the swing shaft 38. In the state shown in FIG. 3 in which the lock lever 37 is protruded from the handle housing 31, the protrusion 37 a of the lock lever 37 contacts a part of the throttle lever 34, thereby restricting the pulling operation of the throttle lever 34. Further, when the lock lever 37 is pushed in and rotated clockwise around the swing shaft 38, the pulling operation of the throttle lever 34 is performed when the position of the projecting portion 37a is shifted and can enter the groove portion 34b. Since it is allowed, the operator can operate the throttle lever 34. Since the throttle lever 34 and the lock lever 37 are biased in the direction opposite to the operator's operation direction by the spring 36, the throttle lever 34 and the lock lever 37 are initially shown in FIG. Return to position.

  On the front side of the throttle lever 34 and the lock lever 37, a lock release lever (first lock member) for releasing the rotation lock around the first rotation axis B1 and the second rotation axis C1 of the rear handle portion 30. 50 is provided. The lock release lever 50, the lock lever 37, and the throttle lever 34 are accommodated in concave portions that sandwich the dividing surface of the handle housing 31. The lock release lever 50 is a member that operates the push button type operation unit 50a to be pushed downward as indicated by an arrow 68 in the state shown in FIG. 3, and is an elongated hole 50c provided in the lock release lever 50. The holding pin 51 is held so as to be movable in a direction parallel to the dividing surface of the handle housing 31. Near the lower side of the unlocking lever 50, a second stopper piece 50d for allowing or preventing rotation around the second rotation axis C1 is provided. The second stopper piece 50d is engaged with a lock groove 43b formed in the sleeve 40 at the position shown in FIG. A second lock member 60 is provided below the lock release lever 50. The second lock member 60 is held so as to be swingable about the swing shaft 47, and the first stopper piece 60a, which is the tip of the arm-like free end, is secured to the lock hole 41c of the sleeve 40 (FIG. 4). ) And penetrates the stopper groove 3b to prevent the rear handle portion 30 from rotating about the first rotation axis B1. When the first stopper piece 60a is separated from the stopper groove 3b through the lock hole 41c provided in the circumferential direction of the sleeve 40, the rear handle portion 30 is allowed to rotate around the first rotation axis B1.

  The lock release lever 50 is disposed in the internal space of the rear handle portion 30 except for the vicinity of the operation portion 50a, and is erected downward from the substantially rectangular parallelepiped slide body 50b extending in the upper limit direction and the slide body 50b. A claw-shaped pressing surface 50e is formed. In the vicinity of the pressing surface 50e and in the vicinity of the sleeve 40, a convex second stopper piece 50d that abuts a concave portion (lock groove 43b described later) formed in the sleeve 40 is formed. The lock release lever 50 is movable on the same plane as the split surface of the handle housing 31. On the other hand, the second lock member 60 is held so that the position of the swing shaft 47 does not change with respect to the sleeve 40. Even if the handle housing 31 is rotated around the first rotation axis B1, the contact state between the pressing surface 50e of the lock release lever 50 and the action surface 60b of the second lock member 60 does not change. During this rotation, the rotation of the first rotation axis B1 is fixed by fitting one of the plurality of stopper grooves 3b provided in the circumferential direction on the inner peripheral side of the mounting portion 3a with the first stopper piece 60a. .

  When the relative position between the rear handle portion 30 and the main body frame 3 is changed by rotating the handle housing 31 around the first rotation axis C1, the longitudinal direction of the lock release lever 50 and the longitudinal surface of the second lock member 60 are changed. Since the angle formed by the direction changes, the contact state between the pressing surface 50e of the lock release lever 50 and the working surface 60b of the second lock member 60 is also changed. However, since the pressing surface 50e only pushes the action surface 60b downward, even if the relative angle on the longitudinal surface side changes, there is no problem with the pressing action itself. Thus, even if the handle housing is rotated around the second rotation axis C1, the action from the lock release lever 50 to the second lock member 60 can be performed. When the relative position between the rear handle portion 30 and the main body frame 3 changes, one of the plurality of lock grooves 43a to 43c (described later in FIG. 4) provided on the inner peripheral side of the sleeve 40 is brought into contact with the second stopper piece 50d. . Therefore, the operation plane of the rear handle portion 30 can be swung in the left-right direction, and the rear handle portion 30 can be fixed at a plurality of positions in the left-right direction considering the state of FIG.

  A blocking member 50f, which is a means for blocking the operation of the throttle lever 34, is provided behind the elongated hole 50c of the unlocking lever 50. When the lock release lever 50 is pressed in the direction of the arrow 68 and the blocking member 50f moves downward, the blocking member 50f is positioned in front of the swinging piece 34d of the throttle lever 34, so that the throttle lever 34 cannot be pulled. . On the other hand, when the throttle lever 34 is being pulled, the rocking piece 34d enters the arcuate portion on the lower side of the blocking member 50f, so that the lock release lever 50 cannot be moved in the direction of the arrow 68. As described above, when the centrifugal clutch is connected and the work equipment is operating, the operation of changing the mounting angle of the rear handle portion 30 cannot be performed. The operation of the unlocking lever 50 may be interlocked with the engine stop switch 57 so that the unlocking lever 50 cannot be operated unless the stop switch 57 is in the stop state. In this case, the lock release lever 50 cannot be operated unless the engine is stopped.

  4 is a cross-sectional view taken along the line DD of FIG. The outer peripheral surface of the sleeve 40 has a slightly thin outer diameter, a small diameter portion 40a that becomes a sliding surface with respect to the mounting portion 3a of the main body frame 3, and a rear side of the small diameter portion 40a and the outer diameter is slightly thickened. A large diameter portion 40b is formed. The small-diameter portion 40a is disposed so as to enter the internal space of the main body frame 3, and the sleeve 40 is formed by a C-ring 45 disposed in a continuous groove 40c continuous in the circumferential direction formed on the outer peripheral surface on the front side of the small-diameter portion 40a. Is held so as not to fall backward from the main body frame 3. The large-diameter portion 40b is a portion to which the second rotation shaft 42 sandwiched by the handle housing 31 is attached, and a cylindrical second rotation shaft 42 extending in the radial direction is formed at two locations of the large-diameter portion 40b. . The engaging portion 33 of the handle housing 31 is engaged with the second rotating shaft 42. At this time, the front end surface of the handle housing 31 is formed obliquely so as to incline backward as indicated by arrows 31c and 31d, so that the handle housing 31 is predetermined in the left-right direction around the second rotation axis C1. It is held so as to be swingable by an angle θ.

  On the inner peripheral front side of the sleeve 40, a tip end portion of the second lock member 60, that is, a lock hole 41c that allows the first stopper piece 60a to pass therethrough is formed. The first stopper piece 60a penetrating the lock hole 41c comes into contact with any one of the stopper grooves 3b (see FIG. 3) which are recessed portions provided in the circumferential direction on the inner peripheral side of the mounting portion 3a. The position around the first rotation axis B1 is fixed. On the rear side of the inner peripheral surface 41 a of the sleeve 40, the tip end portion (second stopper piece 50 d) of the lock release lever 50 is accommodated, and a relief is provided for securing a space for this to swing together with the handle housing 31. A surface 41b is formed, and three lock grooves 43a to 43c are formed on the upper inner wall. When the second stopper piece 50d of the lock release lever 50 is fitted into any of the lock grooves 43a to 43c, the swing position of the rear handle portion 30 around the second rotation axis C1 is fixed. 4 (2) shows a state in which the handle housing 31 is swung in the minus direction (left direction) by an angle θ from the state (1). The second stopper piece 50d of the lock release lever 50 is shown in FIG. A state in which the fitting state with the lock groove 43b shown in (1) is changed to the fitting state with the lock groove 43c shown in (2) is shown. Since the three lock grooves 43a to 43c are formed, the rear handle portion 30 can be fixed at three locations around the first rotation axis B1.

  FIG. 5 is a cross-sectional view showing a single shape of the sleeve 40, (1) is a cross-sectional view in a plane including the first rotation axis B1 and the second rotation axis C1, and (2) is an E- It is sectional drawing of the E section. The main body frame 3 and the handle housing 31 are connected via the sleeve 40 in order to realize rotation around the first rotation axis B1 and the second rotation axis C1. The sleeve 40 is a substantially cylindrical integral product made of metal or synthetic resin, and the cylindrical outer peripheral surface comes into contact with a cylindrical mounting surface (inner peripheral surface) formed on the main body frame 3, thereby The rotation axis B1 is held so as to be rotatable. A lock hole 41c through which the first stopper piece 60a of the second lock member 60 passes is formed in front of the second rotation axis C1 of the sleeve 40. Lock grooves 43 a to 43 c are formed in the upper end rear wall surface of the sleeve 40. In this way, the cylindrical outer peripheral surface of the sleeve 40 is used as a rotation shaft around the first rotation axis B1, and the second rotation shaft 42 is further formed on the sleeve 40. Therefore, two rotating shaft mechanisms can be realized with only one sleeve 40.

  Next, the operation of the unlock lever 50 that locks the rotation of the rear handle 30 will be described with reference to FIG. FIG. 6 is a partially enlarged view of the vicinity of the first rotation axis B1 and the second rotation axis C1 of FIG. 3, in which (1) presses the operation portion 50a of the lock release lever 50 about half as indicated by an arrow 68a. State. In the state (1), the lock release lever 50 moves about half of the maximum movable amount, so that the second stopper piece 50d is not released from the engagement state with the lock groove 43b of the sleeve 40. In this state, the rear handle portion 30 cannot rotate about the second rotation axis C1. On the other hand, the position of the first stopper piece 60a of the second lock member 60 is separated from the stopper groove 3b of the main body frame 3, and its tip is retracted to the inside of the lock hole 41c of the sleeve 40. Rotation around the movement axis B1 is allowed. In the circumferential direction on the inner peripheral side of the attachment portion 3a, five stopper grooves 3b into which the first stopper pieces 60a are fitted are formed at 45 ° intervals about the first rotation axis B1. The operator rotates the rear handle 30 with the lock release lever 50 pushed in half, and when the first stopper piece 60a is positioned at an angle facing the arbitrary stopper groove 3b, the operator releases the lock release lever 50. By returning, the first stopper piece 60a is fitted into the adjacent stopper groove 3b, and the rotation of the rear handle portion 30 is locked.

  FIG. 6B is a diagram illustrating a state in which the operation unit 50a of the lock release lever 50 is further pushed as shown by an arrow 68b and moved to the full position. Here, the first stopper piece 60a is also separated from the lock hole 41c inward, but even in this state, the rotation of the rear handle 30 around the first rotation axis B1 is allowed. Further, since the unlocking lever 50 has moved the maximum amount downward, the second stopper piece 50d is separated from the lock groove 43b of the sleeve 40, and the engagement state thereof is released, so that the rear handle portion 30 can also rotate around the second rotation axis C1. The operator can turn both around the first rotation axis B1 and around the second rotation axis C1 by fully pushing the operating portion 50a of the lock release lever 50, so that any desired position can be obtained. The rear handle portion 30 can be fixed at. In addition, when rotating around the first rotation axis B1 and the second rotation axis C1, it is only necessary to operate one lock release lever. Realized. Further, the newly added rotation mechanism around the second rotation axis C1 is behind the sliding surface around the first rotation axis B1, and is only devised by the internal mechanism of the rear handle 30. Thus, since the novel structure of the present embodiment is realized, the present embodiment can be easily realized by simply replacing the handle portion of the conventional hedge trimmer with the rear handle portion 30 of the present embodiment.

  Next, a second embodiment of the present invention will be described with reference to FIG. In the first embodiment, when the unlocking lever 50 is arranged at the first position (pressed about halfway), the handle is allowed to rotate around the horizontal rotation axis, and the second position (full) The handle is configured to be allowed to rotate both about the horizontal rotation axis and about the orthogonal rotation axis. However, when the lock release lever 50 is disposed at the second position, it may be difficult to use if the lock release lever 50 is rotatable around both rotation axes. Therefore, in the second embodiment, when the unlocking lever 50 is disposed at the second position, the handle is allowed to rotate only around the second rotation axis C1, and the rotation around the first rotation axis B1 is allowed. The rotation was prevented. FIG. 7 is a partially enlarged view of the hedge trimmer according to the second embodiment of the present invention in the vicinity of the first rotation axis and the second rotation axis.

  In the second embodiment, the configuration of the lock release lever 50 is the same as that of the first embodiment, but the shape of the rotation stopper 80 moved by the lock release lever 50 is different. The rear end side of the rotation stopper 80 is pivotally supported by the swing shaft 47 at a position where it does not rotate relative to the sleeve 70. A first stopper piece 80 a is formed in the upper front portion of the handle housing 31. The first stopper piece 80a passes through a lock hole 71c formed in the sleeve 70 during locking and engages with the stopper groove 3b. When unlocked, the first stopper piece 80a is formed in the sleeve 70 as shown in FIG. Retreat inside the lock hole 71c. However, a third stopper piece 80c is formed at the lower front side of the rotation stopper 80, and the third stopper piece 80c passes through the lock hole 71d formed in the sleeve 70 and fits into the stopper groove 3c. As a result, the sleeve 70 cannot rotate around the first rotation axis B1. On the other hand, when the lock release lever 50 is disposed at the second position, the second stopper piece 50d is detached below the lock groove 43b, so that rotation around the second rotation axis C1 is allowed. .

  In the second embodiment, only the shape of the rotation stopper 80 and the sleeve 70 is changed, and the shape of the attachment portion 3a of the main body frame 3 is changed. When the lock release lever 50 is in the first position, the first rotation axis Only the rotation around B1 is allowed, and only the rotation around the second rotation axis C1 is allowed at the second position, and the orthogonal rotation of the rear handle 30 is made according to the pushing amount of the operation portion 50a. The fixation release around the orthogonal rotation axis C1 as the axis and the fixation release around the horizontal rotation axis B1 are switched. Note that the throttle lever 34 cannot be operated because the blocking member 50f is located on the front side of the locking portion 34c regardless of whether the lock release lever 50 is in the first or second position. This is the same as the embodiment.

  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, the present invention is not limited to the hedge trimmer, and can be widely applied to a portable working machine having a handle portion that is provided so as to be rotatable with respect to a main body such as a cutting machine or a chain saw.

DESCRIPTION OF SYMBOLS 1 Hedge trimmer 2 Main-body part 3 Main body frame 3a Mounting part 3b, 3c Stopper groove 4 Cylinder cover 5 Front handle 7 Top cover 8 Air cleaner chamber cover 9 Muffler cover 10 Vaporizer 11 Power transmission mechanism part 12 Fuel tank 13 Fuel cap 14 Engine stop switch 16 Hand guard 19 Starter handle 20 Blade part 23 Blade 23a Upper blade 23b Lower blade 24 Blade guide 30 Rear handle part 30a Grip part 31 Handle housing 31a Right side housing 31b Left side housings 32a to 32d Screw boss 33 Engaging part 34 Throttle lever 34b Groove part 34c Locking part 34d Oscillating piece (regulating member)
35 Oscillating shaft 36 Spring 37 Lock lever 37a Protruding portion 38 Oscillating shaft 39 Throttle wire 40 Sleeve 40a Small diameter portion 40b Large diameter portion 40c Annular groove 41a Inner peripheral surface 41b Escape surface 41c Lock hole (hole portion) 42 Second Rotating shafts 43a to 43c Lock groove 45 C ring 47 Oscillating shafts 49a to 49d Screw 50 Lock release lever (first lock member)
50a Operation part 50b Slide body 50c Slot 50d Second stopper piece (regulation piece) 50e Pressing surface 50f Blocking member 51 Holding pin 57 Stop switch 60 Second lock member 60a First stopper piece (regulation piece) 60b Working surface 69a First Sliding part 69b Second sliding part 70 Sleeve 71c, 71d Lock hole 80 Rotating stopper 80a First stopper piece 80b Working surface 80c Third stopper piece 82 Second rotation axis A1 Longitudinal central axis (center line) B1 First Rotation axis (horizontal rotation axis)
C1 Second rotation axis (orthogonal rotation axis) D1 (Rear handle part) split surface

Claims (15)

A main body provided with a drive source;
A working tool connected to the drive source and reciprocating in the front-rear direction;
An operation lever capable of adjusting the output of the drive source, and a handle connected to the rear side of the main body and extending in the front-rear direction;
The portable work machine according to claim 1, wherein the handle is configured to swing an operation plane of the operation lever in a horizontal direction parallel to a reciprocating surface, and can be fixed at a plurality of positions in the horizontal direction.   The portable work machine according to claim 1, wherein an orthogonal rotation shaft for swinging the handle in the left-right direction is provided on a rear side of a connection point between the main body and the handle. A first locking member that switches between a released state and a fixed state of rotation around the orthogonal rotation axis of the handle;
3. The portable work machine according to claim 2, wherein the first lock member has an operation unit, and the operation unit is provided at a position where an operator can operate the device while holding the handle.   The portable work machine according to claim 3, further comprising a restricting member that prevents the operation portion of the first lock member from moving when the operation lever is operated.   The handle and the main body are connected to the reciprocating surface by a turning mechanism that can turn around a horizontal turning shaft extending in a substantially horizontal direction, and the orthogonal turning shaft is connected to the horizontal turning shaft. 5. The portable work machine according to claim 3, wherein the portable work machine is disposed rearward of the center point of the rotation mechanism.   The portable work machine according to claim 5, wherein the handle can be fixed at a plurality of positions around the orthogonal rotation axis. A second lock member that switches between a release state and a fixed state of rotation of the handle around the horizontal rotation axis;
The portable work machine according to claim 5 or 6, wherein the first lock member and the second lock member can be operated by a common operation unit.   8. The portable device according to claim 7, wherein the handle is switched between unlocking of the handle around the orthogonal rotation axis and unlocking of the handle around the horizontal rotation axis in accordance with a pressing amount of the operation unit. Work machine. A main body provided with a drive source;
A working tool driven by the drive source;
A handle portion having an operation lever connected to the rear side of the main body portion and capable of adjusting the output of the drive source;
The handle portion can be rotated with respect to the main body portion by a horizontal rotation shaft, and further, can be rotated by an orthogonal rotation shaft at a rear side of the center point of the rotation mechanism of the horizontal rotation shaft. The portable working machine can be fixed at a plurality of locations on each of the horizontal rotation shaft and the orthogonal rotation shaft. The first and second lock members for restricting the rotation of the handle portion around the horizontal rotation axis and the orthogonal rotation axis and fixing the handle portion to the main body portion are provided,
The portable work machine according to claim 9, wherein the first lock member and the second lock member can be simultaneously operated by a common operation unit.   The operation portion allows the handle portion to rotate around the horizontal rotation axis when disposed at the first position, and the operation portion is orthogonal to the handle portion when disposed at the second position. The portable work machine according to claim 10, wherein the portable work machine allows rotation about a rotation axis. The horizontal rotation shaft and the orthogonal rotation shaft are sleeves that are formed in a cylindrical shape that allows horizontal rotation, and a rotation shaft that extends in a right angle direction from a position 180 degrees away from the outer peripheral portion on the rear side.
The portable work machine according to claim 11, wherein the handle portion is pivotally supported by the main body portion using the sleeve.   13. The portable device according to claim 12, further comprising means for preventing operation of the operation lever when the first lock member and the second lock member allow the handle portion to rotate. Work machine. The sleeve engages with a restriction piece of the first lock member and engages with a plurality of holes arranged in the circumferential direction, and the restriction piece of the second lock member, and is orthogonal to the sleeve. A plurality of recesses arranged around the rotation axis are formed,
The restriction pieces of the first lock member and the second lock member define a relative position between the main body portion and the handle portion by engaging with either the hole portion or the recess portion. The portable work machine according to claim 13. The first lock member has an operation portion protruding outward from the handle portion, and the first lock member moved by the operation portion presses the second lock member to restrict the second lock member. The portable working machine according to claim 14, wherein the piece is moved.

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