JP2005261393A - Power working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simply carry out rotation operation of a steering wheel by solving the problem in which rotation operation of the steering wheel is complicated. <P>SOLUTION: In the power working machine, cutting blades 13 and 14 for cutting out branches and leaves, or the like, are installed in the front of a machine body 11 and a steering wheel 15 held by an operator is rotatably installed in the rear of the machine body 11 and a throttle lever 36 is swingably installed in the steering wheel and a motor 12 is installed in the center of the machine body 11. The steering wheel 15 is equipped with a fixing mechanism 82 capable of being fixed to a shaft part 32 of the machine body 11 at a prescribed angle, a fixing-releasing lever 81 for carrying out release of the fixing mechanism 82, a stopper member 83 for permitting the operation of the fixing mechanism 82 when regulating swing of the throttle lever 36 and regulating the operation of the fixing mechanism 82 when permitting swing of the throttle lever 36 and a starting switch 39 operating a stopper member 83 and starting the motor 12 by liftably attaching it to the steering wheel 15. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a power working machine that can improve workability by rotating a handle according to a trimming position when trimming an upper surface or a side surface of a hedge.

As a power working machine, a handle is mounted on the machine body, a throttle lever for adjusting the power output is provided on the handle, and a throttle lever that can lock the throttle lever is provided for practical use. Yes.
In addition to the throttle lever and throttle lock lever, a practical power work machine is practically sufficient if it is equipped with a locking mechanism that stops the rotation of the handle and a lock release lever that releases this locking mechanism. there were.

As such a power working machine, one having a locking mechanism linked to a throttle wire is known (for example, refer to Patent Document 1).
Japanese Patent Laid-Open No. 11-28683 (page 11, FIG. 4)

  FIG. 13 is a diagram for explaining a conventional basic configuration. A power working machine 200 includes a handle 202 rotatably attached to a machine body 201, a throttle lever 203 swingably attached to the handle 202, and the throttle lever 203. A handle provided with a throttle fixing lever 204 that locks the lever and a locking member 205 that abuts against the machine body 201 and stops the rotation of the handle 202 by protruding to the machine body 201 side with the operation of the throttle lever 203 It is a working machine with a structure.

  That is, the throttle fixing lever 204 is removed from the throttle lever 203 as indicated by an arrow c1, and the throttle lever 203 is grasped as indicated by an arrow c2, thereby causing the locking member 205 to protrude as indicated by an arrow c3. Lock it.

  However, in the power work machine 200, the handle 202 is rotated to a predetermined angle with respect to the machine body 201, and the throttle fixing lever 204 is released from the throttle lever 203 in order to lock the handle 202 to the machine body 201 side. Since the handle 203 is locked by holding the lever 203 and pressing the locking member 205 toward the machine body 201, there is a problem that the rotation and fixing operation of the handle 202 becomes complicated.

  Further, in the power work machine 200, since the rotation of the handle 202 cannot be locked simultaneously with the release of the throttle fixing lever 204 from the throttle lever 203, for example, depending on the timing of the connection function such as a centrifugal clutch, the handle 202 is connected to the machine body 201 side. There is a drawback in that there is an uncertain place where the cutting blade (not shown) operates before locking.

  That is, the handle rotation operation can be performed by a simple (simple) operation, for example, the throttle cannot be operated during the handle rotation operation, and the handle rotation operation cannot be performed during the throttle lever operation. A power working machine that can prevent erroneous operations by taking measures is desired.

  The present invention solves the point that the steering wheel rotation operation is complicated and can easily perform the steering wheel rotation operation, and also solves the point that includes uncertainty in the throttle lever operation and the steering wheel rotation operation. It is an object of the present invention to provide a power working machine capable of reliably performing a handle rotation operation.

  The invention according to claim 1 is provided with a cutting blade that cuts branches and leaves at the front of the machine body, and a handle that is gripped by an operator is provided at the rear of the machine body so that the throttle lever can be rotated from the non-working position to the working position. In a power working machine of the type in which a prime mover is installed in the center of the machine, a cutting blade is driven by this prime mover, and the output of the prime mover is adjusted by a throttle lever, the handle and the shaft part of the machine at a predetermined angle A lock mechanism that can be locked, a lock release lever that releases the lock mechanism, and a lock mechanism that allows the lock mechanism to operate when the throttle lever swing is restricted and locks when the throttle lever swing is allowed. A stopper member that regulates the operation of the mechanism, and a starter switch that operates the stopper member by attaching it to the handle so that it can be raised and lowered and starts the prime mover. Characterized by comprising a switch, the.

That is, by providing a lock release lever for releasing the lock mechanism on the handle, the handle is rotated separately from the operation of the throttle lever.
When the throttle lever swing is restricted, the operation of the locking mechanism is allowed, and when the throttle lever swing is allowed, the stopper member that restricts the operation of the locking mechanism is provided on the handle. Rotation of the handle is prohibited, and operation of the throttle lever is prohibited during the rotation of the handle.

  In addition, a start switch for starting the prime mover to operate the stopper member is attached to the handle so that the starter can be moved up and down, so that the start switch also functions as the stopper member.

In the invention according to claim 1, by providing the handle with a lock release lever for releasing the lock mechanism, the handle can be rotated separately from the operation of the throttle lever. As a result, there is an advantage that the handle rotation operation can be easily performed and the workability of the handle operation can be improved.
When the throttle lever swing is restricted, the operation of the locking mechanism is allowed, and when the throttle lever swing is allowed, the stopper member for restricting the operation of the locking mechanism is provided on the handle. The rotation operation of the handle can be prohibited, and the operation of the throttle lever can be prohibited during the rotation operation of the handle. As a result, there is an advantage that the throttle lever operation and the handle rotation operation can be reliably performed.

  In addition, since the start switch for starting the prime mover to operate the stopper member is attached to the handle so as to be able to be raised and lowered, the start switch also functions as the stopper member. As a result, the functions can be concentrated on the start switch, and the operability of the power work machine can be improved.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a perspective view of a power work machine according to the present invention. A power work machine (portable work machine) 10 decelerates the rotation of a prime mover (power source) 12 such as an engine and reciprocates the reduced rotation. This reciprocating motion is transmitted to the upper and lower cutting blades (cutting blades) 13 and 14, and the upper and lower cutting blades 13 and 14 are used to cut the hedge (hedge). The handle 15 can be rotated according to the work posture of the operator when the upper surface is trimmed or when the side of the hedge is trimmed. The power work machine 10 is specifically a hedge trimmer for trimming a hedge or the like.

  FIG. 2 is a side view of a power working machine according to the present invention. A power working machine (hedge trimmer) 10 includes a prime mover 12 mounted on a fuselage 11, a fuel tank 16 for storing fuel supplied to the prime mover 12, and a prime mover. A recoil starter knob 19 for starting 12, a motor cover 21 that surrounds the motor 12, a protector 22 that is provided on the front surface of the motor 12 to prevent jumps such as branches or leaves that occur during trimming, and a bottom of the body 11 A cover member 23 for sliding the hedge into a hedge or the like when cutting, and a handle 15 for supporting the machine body 11 with one hand during the work by providing it rotatably behind the machine body 11, and the machine body 11 A non-rotating and closed-loop fixed handle 24 that supports the airframe 11 with the other hand during operation, and in front of the airframe 11. The support frame 25 that supports the upper and lower cutting blades 13, 14 by being taken out, the upper and lower cutting blades 13, 14 that are slidably attached to the support frame 25, and the cutting blades 13, 14 are supported by the support frame 25. (... indicates a plurality. The same shall apply hereinafter) and nuts 27... Screwed into these mounting screws 26.

FIG. 3 is a side sectional view of the handle of the power working machine according to the present invention, in which the left handle half 33 of the left and right handle halves 33, 34 (see FIG. 1) is removed. Indicates the state.
The machine body 11 is provided with a case body 31 having a built-in deceleration function for decelerating the rotation of the prime mover 12 and a conversion function for converting the decelerated rotation into a reciprocating motion. A shaft portion 32.

  The handle 15 is assembled by combining the left and right handle halves 33, 34 (33 are not shown), and the motor 15 is rotatably mounted on the handle body 35 (see FIG. 2). ), A throttle fixing lever (throttle lock lever) 37 that is swingably attached to the handle body 35 to lock the throttle lever 36, a lock release lever 81, and a lock mechanism 82. Are integrally formed, a lever complex 38 for rotating the handle from the body 11 or locking the handle to the body 11, a start switch 39 for starting or stopping the prime mover 12, and a throttle When the swing of the lever 36 is restricted, the operation of the lever complex 38 is allowed. A stopper mechanism 41 for regulating the operation of the lever complex 38 when allowed to swing monitor the throttle lever 36, made of. The throttle fixing lever 37 includes a torsion spring 42 that returns to the initial state.

FIG. 4 is an exploded perspective view showing main parts of the handle of the power working machine according to the present invention.
The shaft portion 32 includes an attachment portion 51 attached to the case body 31 (see FIG. 2), a cylindrical portion 52 that rotatably supports the handle body 35, and a groove 53 for locking the handle body 35 at a predetermined angle.・ To be provided.

  The left handle half 33 supports (holds) the left fitting portion 54 to be fitted to the shaft portion 32, stopper guide portions 56 and 56 that slidably support the stopper mechanism 41, and the lever complex 38. ) A support rib (holding portion) 57 and lever guide portions 58 and 59 for slidably guiding the lever complex 38 are provided.

  The right handle half 34 has a throttle lever boss 61 for rotatably mounting the throttle lever 36, a fixed lever boss 62 for rotatably mounting the throttle fixing lever 37, and a right fitting for fitting the shaft portion 32. A portion 64, a switch support portion 66 that supports the start switch 39 so as to be movable up and down, a spring hook portion 67 that supports one end of the torsion spring 42, and guide portions 68 and 69 that guide the lever complex 38 slidably, Is provided.

The throttle lever 36 allows the throttle lever boss 61 to be rotatably fitted, a support portion 73 that supports the throttle wire 72, a contact portion 74 that contacts the throttle fixing lever 37, and the throttle fixing lever 37. The escape part 75 and the fitting parts 76 and 76 which fit a stopper member are provided.
The throttle fixing lever 37 supports a hole 77 that is rotatably fitted to the fixing lever boss 62, an action portion 78 that makes contact with the contact portion 74 of the throttle lever 36 or escapes to the escape portion 75, and the other end of the torsion spring 42. A spring support portion 79 (see FIG. 3).

  The lever complex 38 includes a lock release lever 81 and a lock mechanism 82 formed integrally with the lock release lever 81. The locking release lever 81 is a member that moves along the axis (not shown) of the shaft portion 32.

  The stopper mechanism 41 includes a stopper member 83 that restricts the movement of the throttle lever 36 and the operation of the locking mechanism 82, a start switch 39 that operates integrally by attaching the stopper member 83, and the start switch 39 and the right This is composed of compression springs 85 and 85 for returning the start switch 39 and the stopper member 83 to the initial state by being interposed between the switch support portion 66 of the handle half body 34.

  The stopper member 83 includes a first engaging portion 86 that engages with the throttle lever 36 when the locking mechanism 82 is released, and a second engaging portion 87 that engages with the locking mechanism 82 when the throttle lever 36 swings. , And is a member that moves perpendicularly to the axis of the shaft portion 32.

  FIG. 5 is a cross-sectional view of the locking release lever and the locking mechanism of the power working machine according to the present invention, and the locking mechanism 82 is fitted in an arbitrary groove 53 (see FIG. 4) of the shaft portion 32. A projection 92 to be joined, an extension portion 93 formed integrally with the locking release lever 81 by extending from the projection 92 to the rear of the handle 15, a spring holding portion 94 formed on the extension portion 93, A return spring 95 for returning the entire lever complex 38 (the lock release lever 81 and the lock mechanism 82) by supporting the front end on the spring holding portion 94 and supporting the rear end on the support rib 57, and an extension portion And a step portion 96 that engages with the second engaging portion 87 of the stopper member 83 by being formed on the stopper member 83, and is a mechanism that can be locked to the shaft portion 32 of the airframe 11 (see FIG. 2) at a predetermined angle. is there.

  FIG. 6 is a longitudinal sectional view of the unlocking lever and the locking mechanism of the power working machine according to the present invention. That is, the locking mechanism 82 houses a return spring 95 in the spring holding portion 94, and this return spring 95. The rear end is supported by the support rib 57, and the lever complex 38 is urged toward the front of the handle 15 (see FIG. 2).

  Therefore, by pulling the locking release lever 81 (lever complex 38) to the rear of the handle 15, the protrusion 92 can be removed from the arbitrary groove 53... Of the shaft portion 32 (see FIG. 5). The rotation of the handle 15 can be permitted from FIG. Further, by separating the lever complex 38, the projection 92 can be automatically locked in any of the grooves 53... Reference numeral 65 denotes an auxiliary rib that is formed in the right handle half 34 to prevent the return spring 95 from falling off.

7 is a cross-sectional view taken along line 7-7 in FIG.
The stopper mechanism 41 lowers (presses) the start switch 39 as indicated by the white arrow, and lowers the stopper member 83 integrally, whereby the first engaging portion 86 of the stopper member 83 is engaged with the fitting portion of the throttle lever 36. The second engaging portion 87 can be detached from the stepped portion 96 of the locking mechanism 82 while being engaged with 76 and 76. Thereby, the latch release lever 81 (lever complex 38) shown in FIG.

  8 is a cross-sectional view taken along line 8-8 in FIG. 5 and shows a state in which the protrusion 92 of the locking mechanism 82 is fitted in one of the grooves 53 formed in the shaft portion 32 of the case body 31 (see FIG. 2). The grooves 53... Are formed on the left and right and lower portions of the handle 15 at an angle of 90 degrees, so that the handle can be tilted vertically and horizontally to the body 11 (see FIG. 1). Show. Therefore, the usability of the power work machine 10 (see FIG. 1) can be improved.

  FIG. 9 is an enlarged view of a main part of the power working machine according to the present invention. The power working machine 10 is provided with cutting blades 13 and 14 for cutting branches and the like at the front part of the machine body 11, and an operator at the rear part of the machine body 11. The handle 15 is provided so as to be rotatable, and a throttle lever 36 is provided on the handle 15 so as to be able to swing from a non-working position to a working position. A prime mover 12 is provided in the center of the machine body 11. In the power working machine 10 that is driven and adjusts the output of the prime mover 12 with the throttle lever 36, a locking mechanism 82 that can be locked to the handle 15 and the shaft portion 32 of the machine body 11 at a predetermined angle, and the locking mechanism 82. When the swing of the lock release lever 81 and the throttle lever 36 is restricted, the lock mechanism 82 is allowed to operate and the throttle lever 36 is allowed to swing. When you are those having a stopper member 83 for restricting the operation of the locking mechanism 82, a start switch 39 for starting the engine 12 with operating the stopper member 83 in the vertically movably attached to the handle 15, the.

  The power work machine 10 has a prime mover 12 attached to the machine body 11, the cutting blades 13 and 14 are driven by the prime mover 12, and a handle 15 is rotatably attached to the machine body 11 via a locking mechanism 82. 15 can be said to be provided with a throttle lever 36 for adjusting the output of the prime mover 12.

  For example, if it is possible to easily perform the handle rotation operation, it is preferable because the workability of the handle operation can be improved, so that the throttle lever operation and the handle rotation operation can be performed reliably. This is preferable because it helps prevent erroneous operation.

  That is, by providing the handle 15 with the lock release lever 81 that releases the lock mechanism 82, the handle 15 can be rotated separately from the operation of the throttle lever 36. As a result, the handle 15 can be easily rotated, and the workability of the handle 15 can be improved.

  When the swing of the throttle lever 36 is restricted, the operation of the locking mechanism 82 is allowed, and when the swing of the throttle lever 36 is allowed, the stopper 15 that restricts the operation of the locking mechanism 82 is provided on the handle 15 so that the throttle During the operation of the lever 36, the rotation operation of the handle 15 can be prohibited, and the operation of the throttle lever 36 can be prohibited during the rotation operation of the handle 15. As a result, the operation of the throttle lever 36 and the rotation of the handle 15 can be reliably performed.

  Further, a start switch 39 for starting the prime mover 12 to operate the stopper member 83 is attached to the handle 15 so as to be movable up and down, so that the start switch 39 also functions as the stopper member 83. As a result, the functions can be concentrated on the start switch 39, and the operability of the power work machine 10 (see FIG. 1) can be improved.

Further, the start switch 39 for operating the stopper member 83 is arranged at the upper front part of the handle 15 so that when the stopper member 83 is operated for rotating the handle 15, the handle 15 is located in front of the handle 15 away from the throttle lever 36. It can be operated, and it is possible to avoid confusion between the operation of the throttle lever 36 and the operation of rotating the handle 15.
As a result, the operation of the throttle lever 36 and the rotation of the handle 15 can be reliably performed.

  By providing the start switch 39 with compression springs 85 and 85 as resilient means for returning to the initial state, if the hand is released from the start switch 39 and the lock mechanism 82 and the lock release lever 81 are returned. The start switch 39 can be automatically returned to the initial state. As a result, it is possible to improve the operability of the rotation operation of the handle 15 of the power work machine 10 (see FIG. 1).

  By using a slide switch that can be switched in the front-rear direction of the handle 15 as the start switch 39, the direction of the original switching front-rear operation of the start switch 39 and the raising / lowering operation of the stopper member 83 can be made different. As a result, the switching operation of the start switch 39 and the stopper member 83 can be reliably performed.

The operation of the power working machine 10 described above will be described.
10 (a) and 10 (b) are operation explanatory views showing the handle locking state and the lever complex lock state of the power working machine according to the present invention.
In (a), since the operating portion 78 of the throttle fixing lever 37 is in contact with the contact portion 74 of the throttle lever 36, it is possible to prevent the throttle lever 36 from being pulled as shown by the arrow b1.

  In (b), the operating portion 78 is released from the contact portion 74 by pushing the throttle fixing lever 37 as shown by the arrow b2. As a result, the throttle lever 36 can be brought into an operable state.

FIGS. 11A and 11B are operation explanatory views showing the throttle lever operating state and the handle rotating state of the power working machine according to the present invention.
In (a), by pulling the throttle lever 36 as shown by the arrow b3, the operating portion 78 of the throttle fixing lever 37 is released to the escape portion 75 of the throttle lever 36, and the upper and lower cutting blades 13 and 14 shown in FIG. Pruning work can be performed.

  In FIG. 10B, the first engagement of the stopper member 83 is achieved by lowering the start switch 39 as shown by the arrow b4 from the state of the throttle lever 36, the throttle fixing lever 37 and the lever complex 38 shown in FIG. The mating portion 86 can be fitted into the fitting portion 76 of the throttle lever 36 and the second engaging portion 87 can be removed from the step portion 96 of the locking mechanism 82. As a result, the throttle lever 36 can be locked, and the composite lever 38 (the lock release lever 81 and the lock mechanism 82) can be pulled rearward as indicated by the arrow b5, and the handle 15 can be rotated. can do.

12 (a) to 12 (c) are operation explanatory views showing the setting position of the handle of the power working machine according to the present invention. In the figure, the grooves 53... Of the shaft portion 32 are described by distinguishing them into a left groove 53L, a central groove 53C, and a right groove 53R.
In (a), it is the state of the power working machine 10 when the handle 15 is rotated 90 degrees to the left. For example, this setting is convenient when trimming the lower side of a side such as a hedge, as shown in (b) Further, the protrusion 92 of the locking mechanism 82 is fitted in the right groove 53R.

  In (c), it is the state of the power working machine 10 in which the handle 15 is set at a regular position, and is a setting that is convenient when, for example, trimming the upper surface of a hedge or the like, as shown in (d), The protrusion 92 of the mechanism 82 is fitted in the left groove 53C.

  In (e), it is the state of the power working machine 10 when the handle 15 is rotated 90 degrees to the right. For example, this setting is convenient when trimming the upper side of a hedge or the like, as shown in (f) Further, the protrusion 92 of the locking mechanism 82 is fitted in the left groove 53L.

  Although the power working machine according to the present invention has been described as driving the upper and lower cutting blades 13 and 14 as shown in FIG. 2, the present invention is not limited to this, and one of the upper and lower cutting blades is reciprocated. It may be one that is designed to do.

  In the power working machine according to the present invention, as shown in FIG. 1, the upper and lower cutting blades 13, 14 are both blades having a cutting function on the left and right, but the present invention is not limited to this, and the upper and lower cutting blades are on one side. A single blade having a mowing function may be used.

  In the power working machine according to the present invention, as shown in FIG. 4, the right handle half 34 is provided with the throttle lever boss 61 and the fixed lever boss 62. However, the present invention is not limited to this. The halves may be provided with a throttle lever boss and a fixed lever boss, or both the left and right handle halves may be provided with a throttle lever boss and a fixed lever boss.

In the power working machine according to the present invention, as shown in FIG. 5, the locking release lever 81 and the locking mechanism 82 are integrally formed as a lever complex 38, but the invention is not limited to this. In addition, the locking mechanism may be formed as a separate body, and the locking release lever and the locking mechanism may be combined.
In the power working machine according to the present invention, as shown in FIG. 9, the operation of the locking mechanism 82 is restricted by the stopper mechanism 41. However, the invention is not limited to this, and the locking release lever is restricted by the stopper mechanism. It may be what was made to do.

  The power working machine according to the present invention is suitable for use in a hedge trimmer used for cleaning hedges and the like.

1 is a perspective view of a power working machine according to the present invention. It is a side view of the power working machine which concerns on this invention. It is side surface sectional drawing of the handle | steering_wheel of the power working machine which concerns on this invention. It is a disassembled perspective view which shows the main components of the handle | steering-wheel of the power working machine which concerns on this invention. It is a cross-sectional view of the lock release lever and the lock mechanism of the power working machine according to the present invention. It is a longitudinal cross-sectional view of the latch release lever and the locking mechanism of the power working machine according to the present invention. Fig. 7 is a cross-sectional view taken along line 7-7 in Fig. 5. FIG. 8 is a sectional view taken along line 8-8 in FIG. 5. It is a principal part enlarged view of the power working machine which concerns on this invention. It is operation | movement explanatory drawing which shows the handle | steering-wheel latching state of the power working machine which concerns on this invention, and the locked state of a lever complex. It is an operation explanatory view showing a throttle lever operation state and a handle rotation state of the power working machine according to the present invention. It is operation | movement explanatory drawing which shows the aspect of the setting position of the handle | steering_wheel of the power working machine which concerns on this invention. It is a figure explaining the conventional basic composition.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Power working machine, 11 ... Airframe, 12 ... Prime mover, 13, 14 ... Upper and lower cutting blades, 15 ... Handle, 32 ... Shaft part, 36 ... Throttle lever, 39 ... Start switch, 81 ... Unlocking lever, 82 ... locking mechanism, 83 ... stopper member.

Claims (1)

A cutting blade that cuts branches and leaves etc. is provided at the front of the aircraft, and a handle that is gripped by the operator is provided at the rear of the aircraft, and a throttle lever is provided on this handle so that it can swing from a non-working position to a working position. In the power working machine of the type in which a prime mover is provided in the center, the cutting blade is driven by this prime mover, and the output of the prime mover is adjusted by the throttle lever.
The handle includes a locking mechanism that can be locked to a shaft portion of the airframe at a predetermined angle, a locking release lever that releases the locking mechanism, and an operation of the locking mechanism when the swing of the throttle lever is restricted. And a stopper member for restricting the operation of the locking mechanism when the throttle lever swing is permitted, and a start switch for operating the stopper member and starting the prime mover by being attached to the handle so as to be movable up and down And a power working machine characterized by comprising:

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