JP2009284802A - Power working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power working machine having a simple structure and designed so that its handle can be reliably fixed to the machine body. <P>SOLUTION: The power working machine 101 is configured such that a handle 107 rotatably attached to the machine body 103 is provided with a handle fixing member 125 fixing the handle 107 to the machine body 103 or releasing the fixation, and with an output power adjustment member 131 for adjusting the output power of an engine 111. The handle fixing member 125 separates from the pulling operation area of the output power adjustment member 131 to allow the output power adjustment member 131 to be pulled when placed at a handle fixing position, goes into a pulling operation area 106a to inhibit the output power adjustment member 131 from the pulling operation when put on a handle fixation-releasing position, and further receives the interference by fingers in pulling operation, thus restricting its control movement to the handle fixation-releasing position from the handle fixing position when the output power adjustment member 131 is pulled by the fingers. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a power working machine used for horticultural work such as pruning hedges or pruning roadside trees, and more specifically, a handle attached to the rear part of the machine body is rotated as necessary to be directed to the machine body (working position). It is related with the power work machine of the form which can change.

  This type of power work machine is disclosed in, for example, Japanese Patent No. 12997024 (Patent Document 1). The power working machine described in the above publication has a cutting tool as a tip tool in front of the machine body and a rotatable handle at the rear of the machine body. The handle has a throttle lever that adjusts the output of the prime mover, and a handle lock lever that locks the handle so that it cannot rotate (handle lock), or allows the handle to turn by releasing the lock. I have. In the power work machine described in the above publication, the release operation of the handle lock lever is restricted when the throttle lever is operated to be pulled, while the release of the throttle lever is controlled when the handle lock lever is operated to be released. Both levers cooperate with each other so that the operation is restricted.

However, in the power working machine described in the publication, it is necessary to construct a structure for establishing the above-described cooperative relationship between the throttle lever and the handle lock lever, that is, an engaging structure that contacts each other. As such, there is a possibility of structural complexity, and there is still room for improvement in this respect.
Japanese Patent No. 12997024

  The present invention has been made in view of such points, and an object of the present invention is to provide a technique for securely fixing a handle to a machine body with a simple configuration in a power working machine.

  In order to achieve the above object, a preferred embodiment of a power working machine according to the present invention is a drive that reciprocates linearly in the long axis direction of an airframe and a tip tool that is accommodated in the airframe and disposed in a front end region of the airframe. Have the device. The “driving device” in the present invention is typically composed mainly of a prime mover and a power transmission mechanism that converts the rotational output of the prime mover into a linear motion and transmits it to the tip tool, and the prime mover includes an electric motor, An air motor, an internal combustion engine, etc. are included suitably. In addition, the “powered work machine” in the present invention typically performs a trimming operation such as a hedge with a tip tool composed of an upper blade and a lower blade that are arranged so as to overlap each other and move relatively linearly. This is the case with hedge trimmers (hedge clippers).

  The power working machine of the present invention includes a handle, a plurality of locking portions, a handle fixing member, and an output adjustment member. The handle is disposed in a rear region on the opposite side of the tip tool in the fuselage, and is attached to the fuselage so as to be rotatable about the long axis direction of the tip tool. The plurality of locking portions are provided on the machine body at predetermined angular intervals around the rotation center line of the handle. The handle fixing member is provided on the handle, and a handle fixing position for selectively locking the locking portion to restrict the rotation of the handle, and releasing the locking to the locking portion to allow the handle to rotate. It can be moved by a finger between the handle fixing release positions. The output adjusting member is provided on the handle and can be pulled by a finger to adjust the output of the driving device. In the present invention, the movement of the handle fixing member from the handle fixing position to the handle fixing release position by a finger is preferably performed by a pulling operation. The “moving with the finger” of the handle fixing member typically corresponds to a linear sliding operation, but preferably includes a rotating operation around a horizontal axis.

  According to the preferable form of the power working machine according to the present invention, as a characteristic configuration, the operation direction of the handle fixing member is determined as a direction intersecting with the pulling operation direction of the output adjusting member. When the handle fixing member is placed at the handle fixing position, the handle fixing member is separated from the pulling operation area set for the pulling operation of the output adjusting member to permit the pulling operation of the output adjusting member, and is placed at the handle fixing releasing position. If the output adjustment member enters the pulling operation area, the pulling operation of the output adjustment member is hindered. Further, in the state where the output adjustment member is pulled by a finger, the finger that is being pulled is not interfered. Accordingly, the movement from the handle fixing position to the handle fixing release position is restricted. In the present invention, “hindering the pulling operation” typically means a mode in which the handle fixing member covers the whole or a part of the surface that the finger contacts when pulling the output adjusting member. It corresponds to. In the present invention, “to receive finger interference” typically corresponds to an aspect in which the finger is in the way and the handle fixing member cannot move from the handle fixing position to the handle fixing release position.

  According to the preferable form of the power working machine according to the present invention, the output adjustment member and the handle fixing member are in a state in which the output adjustment member is being pulled without setting an engagement structure that contacts each other. In the state where the release operation of the handle fixing member is restricted while the handle fixing member is placed at the fixed release position, the pulling operation of the output adjustment member is restricted. It is possible to fix the handle to the fuselage.

According to the further form of the power working machine which concerns on this invention, a handle | steering-wheel has a grip part which an operator holds. The output adjusting member and the handle fixing member are arranged adjacent to each other and can be operated by a finger that grips the grip portion.
According to the present invention, since it is possible to operate the handle fixing member with the fingers gripping the grip portion, when operating the handle fixing member, the handle fixing member can be easily operated without re-gripping the grip portion. Operability is improved.

  According to the present invention, in the power work machine, a technique for securely fixing the handle to the machine body with a simple configuration in the power work machine is provided.

  Embodiments of the present invention will be described below with reference to the drawings. This embodiment will be described using a hedge trimmer (hedge clipper) as an example of a power working machine. The overall configuration of the hedge trimmer 101 according to the present embodiment is shown as a side sectional view in FIG. The hedge trimmer 101 mainly includes a housing 103, a front handle 105 disposed on the front side (right side in FIG. 1) and a rear handle 107 disposed on the rear side (left side in FIG. 1) with the housing 103 interposed therebetween. Is done. The housing 103 corresponds to the “airframe” in the present invention, and the rear handle 107 corresponds to the “handle” in the present invention.

  In the housing 103, an electric motor 111 and a motion conversion mechanism 113 that converts the rotational output of the electric motor 111 into a linear motion and transmits the linear motion to the upper and lower blades 115 and 117 are accommodated. The electric motor 111 corresponds to the “motor” in the present invention. The electric motor 111 is disposed vertically with the output shaft on the lower side (rotational axis is in the vertical direction), the motion conversion mechanism 113 is disposed below the electric motor 111, and the blades 115 and 117 are disposed further below. Yes. The upper and lower blades 115 and 117 correspond to the “tip tool” in the present invention. Note that the motion conversion mechanism 113 is a well-known mechanism and is not directly related to the present invention, and therefore the description thereof is omitted. The upper and lower blades 115 and 117 that overlap each other extend horizontally toward the front, and perform a horizontal linear reciprocating motion in opposite directions (in opposite phases) via the motion conversion mechanism 113, thereby Cutting is performed with a leaf as an object to be cut between the blade of the upper blade 115 and the blade of the lower blade 117.

  2 and 3 are enlarged views of part A of FIG. 1, and the configuration of the rear handle 107 is shown. 4 to 6 are views of the hedge trimmer 101 seen from the rear, and the rear handle 107 is omitted in FIG. FIG. 7 is a sectional view taken along line BB in FIG. The rear handle 107 is configured by joining left and right handle halves 107A and 107B (see FIGS. 4 to 6 and 7) having vertical surfaces as mating surfaces. The rear handle 107 is formed in a substantially rectangular closed loop shape as viewed from the side, and an upper region of the rear handle 107 is set as a grip portion 107a that is gripped by an operator. Therefore, the operator can grip the grip portion 107 a by inserting his / her finger into the central space portion 106 at the center portion of the rear handle 107.

  The rear handle 107 has a hollow interior throughout. That is, the rear handle 107 is configured to have a cavity throughout, and a cylindrical portion 121 penetrating horizontally in the front-rear direction is provided at a front position in a lower region of the cavity. Correspondingly, a cylindrical shaft portion 123 is formed on the lower portion of the rear surface of the housing 103 so as to protrude horizontally rearward. Then, the cylindrical portion 121 of the rear handle 107 is loosely fitted to the shaft portion 123 of the housing 103, whereby the rear handle 107 is rotatable about the horizontal axis with the shaft portion 123 as a rotation fulcrum. .

  The rear handle 107 restricts the rotation of the rear handle 107, that is, the handle lock member 125 that can be pushed and pulled in the front-rear direction with fingers for fixing the rear handle 107 to the housing 103, and the electric motor 111 is energized. In addition, a throttle lever 131 that can be pulled upward with fingers to adjust the output of the electric motor 111 is provided. The handle lock member 125 corresponds to the “handle fixing member” in the present invention, and the throttle lever 131 corresponds to the “output adjustment member” in the present invention.

  The throttle lever 131 has a substantially trapezoidal box-shaped outer shape, and the front end side thereof is attached to the grip portion 107a of the rear handle 107 via the horizontal shaft 133 so as to be rotatable in the vertical direction around the horizontal axis, and the grip portion 107a. It is possible to perform an upward pulling operation with a finger gripping. When the throttle lever 131 is pulled upward by fingers, the throttle lever 131 is pulled into the grip portion 107a through the opening 107b formed in the lower side wall surface of the grip portion 107a, and the contact surface of the throttle lever 131 with the finger The position where 131a is substantially flush with the lower side wall surface of the grip portion 107a is the maximum retracting position. Although illustration is omitted for convenience, the electric motor 111 is electrically energized based on the pulling operation of the throttle lever 131 by the operator's finger, and the output is increased according to the pulling amount of the throttle lever 131. It is comprised so that. Since this is a conventionally well-known technique, detailed description is abbreviate | omitted.

  The handle lock member 125 has a rod-shaped lock portion 124 extending in the front-rear direction and a substantially C-shaped (hook-like) operation portion 126 operated by a finger in a side view, and the lock portion 124 is a rear handle 107. The operation portion 126 is disposed in the central space portion 106 of the rear handle 107. And the operation part 126 arrange | positioned in the center space part 106 can be pushed / pulled in the front-back direction with the finger | toe which grasps the grip part 107a. The lock portion 124 made of a rod-like material or pipe is bent at one end in the long axis direction (front-rear direction) upward, and the end is formed in the upper side wall surface in the lower region of the rear handle 107. 107d is connected to the mounting plate 126a of the operation portion 126, and when the operation portion 126 is pushed and pulled, it moves in the front-rear direction along the pore 107d. The pore 107d extends in the front-rear direction with a predetermined length. Further, the mounting plate 126a is slidably attached to the upper wall surface of the lower region of the rear handle 125.

  When the lock portion 124 is moved forward, it engages with a recess 127 formed on the housing 103 side from the rear to restrict the rotation of the rear handle 107, and when it is moved rearward, the lock portion 124 is engaged with the recess 127. The combination is released and the rear handle 107 is allowed to rotate. That is, the handle lock member 125 is movable in the front-rear direction between an engagement position where the lock portion 124 is engaged with the concave portion 127 and an engagement release position where the lock portion 124 is separated from the concave portion 127. The engagement position corresponds to the “handle fixing position” in the present invention, and the release position corresponds to the “handle rotation allowable position” in the present invention.

  A plurality of recesses 127 are formed at predetermined equiangular intervals within a range of approximately 180 degrees in the upper region around the rotation center line of the rear handle 107 at the outer peripheral front end portion (rear end portion) of the shaft portion 123 of the housing 103. 7 in the embodiment) (see FIG. 6). Accordingly, the rear handle 107 selectively engages the lock portion 124 of the handle lock member 125 with the plurality of recesses 127, so that the work position (orientation) is approximately 180 degrees within a predetermined angular interval. It can be changed. 4 shows a state in which the rear handle 107 is adjusted in the vertical direction (vertical posture), and FIG. 5 shows a state in which the rear handle 107 is adjusted in the horizontal direction (horizontal posture). The recess 127 corresponds to a “locking portion” in the present invention.

  In the present embodiment, the operation portion 126 of the handle lock member 125 disposed in the central space portion 106 of the rear handle 107 is close to the lower surface of the throttle lever 131, that is, the finger contact surface 131a when moved rearward. By being placed in the lower region 106a, the pulling operation of the throttle lever 131 is restricted. As shown in FIG. 7, the upper region of the operation portion 126 is formed in a substantially U-shaped cross section, and covers the protruding portion of the throttle lever 131 from the grip portion 107a when moved to the lower region 106a. It is configured. This state is shown in FIGS. The lower area 106a of the throttle lever 131 corresponds to the “pull operation area” in the present invention. On the other hand, when the operation unit 126 is moved forward, the operation unit 126 is retracted from the lower region 106 a of the throttle lever 131 and allows the throttle lever 131 to be pulled. This state is shown in FIG.

  The hedge trimmer 101 according to the present embodiment is configured as described above. In a state where the handle lock member 125 is placed at the steady position shown in FIG. 2, the lock portion 124 is engaged with the recess 127 of the shaft portion 123 and the rear handle 107 is fixed (locked) to the housing 103, and the operation portion 126 is placed in a front area away from the throttle lever 131, and the pulling operation of the throttle lever 131 is allowed.

  In this state, the operator pulls and operates the throttle lever 131 to energize and drive the electric motor 111, and the upper and lower blades 115 and 117 are reciprocated horizontally in the opposite directions (in opposite phases) via the motion conversion mechanism 113. It can cut | disconnect between the branches and leaves as a to-be-cut object. At this time, one or two fingertips (indicated by a two-dot chain line circle in FIG. 2) operating the throttle lever 131 are present in the lower region 106 a of the throttle lever 131. Therefore, when the operator is pulling the throttle lever 131, the fingertip is in the way, and the operation portion 126 of the handle lock member 125 cannot be pulled to the lower region 106 a of the throttle lever 131. That is, during the pulling operation of the throttle lever 131, the rear handle 107 is securely held in the handle lock state fixed to the housing 103, and the rear handle 107 is prevented from being inadvertently rotated. it can.

  On the other hand, when the operator releases his / her hand from the throttle lever 131, the operation portion 126 of the handle lock member 125 is allowed to be pulled to the lower region 106a of the throttle lever 131. Therefore, when the operation part 126 is pulled, the lock part 124 comes out of the concave part 127 of the shaft part 123. Accordingly, since the handle lock of the rear handle 107 is released, the rear handle 107 can be rotated to arbitrarily change the working position of the rear handle 107 within the range of 180 degrees where the concave portion 127 is set. it can. At this time, the operation portion 126 of the handle lock member 125 enters the lower region 106a of the throttle lever 131 and opposes the finger contact surface 131a of the throttle lever 131 in a close proximity. That is, since the operating portion 126 covers the protruding portion of the throttle lever 131 from the grip portion 107a, the upward pulling operation of the throttle lever 131 is thereby restricted. That is, when the rear handle 107 is rotated to change the direction of the rear handle 107, the pulling operation of the throttle lever 131 can be reliably prohibited.

  As described above, according to the present embodiment, the operation portion 126 of the handle lock member 125 is disposed in the front region of the throttle lever 131 that is pulled upward. When the throttle lever 131 is pulled with a finger, the finger is in the way and the pulling operation of the operation portion 126 of the handle lock member 125 is restricted, and the handle lock member 125 is locked with the handle lock. In the state where the lever is operated to release, the handle lock member 125 covers the finger contact surface 131a of the throttle lever 131 to restrict the pulling operation of the throttle lever 131. For this reason, it is possible to restrict simultaneous operation without setting an engagement structure that allows the throttle lever 131 and the handle lock member 125 to contact each other. Therefore, the rear handle 107 can be securely fixed to the housing 103 with a simple structure.

  Further, according to the present embodiment, like the throttle lever 131, the handle lock member 125 is arranged in an area where fingers can reach with the grip portion 107a of the rear handle 107, that is, an area where pulling operation is possible. Yes. Therefore, the operator can easily operate the handle lock member 125 without re-gripping the grip portion 107a, and the operability is improved.

  In the present embodiment, the handle lock member 125 is configured to slide in the front-rear direction, but may be changed to a configuration that rotates in the front-rear direction. In the present embodiment, the concave portion 127 is set in the shaft portion 123 of the housing 103 and the rod-shaped lock portion 124 is set in the handle lock member 125. However, a protrusion is set on the outer periphery of the shaft portion 123, and the lock portion A concave surface corresponding to the protrusion may be set in 124.

It is a sectional side view showing the whole hedge trimmer composition concerning this embodiment. It is an enlarged view of the A section of Drawing 1 showing the composition of a rear handle, and the initial state before a throttle lever and a handle lock member are operated is shown. It is an enlarged view of the A section of Drawing 1 showing the composition of a rear handle, and the state where the handle lock member was pulled is shown. It is the figure which looked at the hedge trimmer from back, and the state by which the rear handle | steering-wheel was adjusted to the vertical orientation is shown. It is the figure which looked at the hedge trimmer from the back, and the state by which the rear handle was adjusted sideways is shown. It is the figure which looked at the hedge trimmer from back, a rear handle is abbreviate | omitted and the recessed part formed in the axial part of the housing is shown. FIG. 4 is a sectional view taken along line BB in FIG. 3.

Explanation of symbols

101 Hedge trimmer (power working machine)
103 Housing (airframe)
105 Front handle 106 Central space 106a Lower area (pull operation area)
107 Rear handle 107A Handle half-split body 107B Handle half-split body 107a Grip portion 107b Opening portion 107d Hole 111 Electric motor (drive device)
113 Motion conversion mechanism (drive device)
115 Top blade (tip tool)
117 Lower blade (tip tool)
121 Cylindrical part 123 Shaft part 124 Lock part 125 Handle lock member (handle fixing member)
126 Operation part 126a Mounting plate part 127 Concave part (locking part)
131 Throttle lever (output adjustment member)
131a Contact surface 133 Horizontal axis

Claims (2)

The aircraft,
A drive device that is housed in the airframe and reciprocates linearly in the major axis direction with a tip tool disposed in a front end region of the airframe;
A handle disposed in a rear region on the opposite side of the tip tool in the machine body, and attached to the machine body so as to be rotatable about a long axis direction of the tip tool;
A plurality of locking portions provided on the airframe at predetermined angular intervals around the rotation center line of the handle;
A handle fixing position that is provided on the handle and selectively locks to the locking portion to restrict the rotation of the handle, and the lock on the locking portion is released to allow the handle to rotate. A handle fixing member that is moved by a finger between the handle fixing release positions;
An output adjusting member provided on the handle and capable of being pulled by a finger to adjust the output of the driving device;
The operation direction of the handle fixing member is determined as a direction intersecting the pulling operation direction of the output adjustment member,
When the handle fixing member is placed at the handle fixing position, the handle fixing member is separated from a pull operation region set for the pull operation of the output adjustment member to allow the output adjustment member to be pulled, and the handle fixing release is performed. When placed in the position, the pulling operation of the output adjusting member is obstructed by entering the pulling operation area. Further, when the output adjusting member is pulled by a finger, the pulling operation is performed. A power working machine characterized in that the movement from the handle fixing position to the handle fixing release position is restricted by the interference of a finger that is present. The power working machine according to claim 1,
The handle has a grip portion gripped by an operator,
The power working machine, wherein the output adjusting member and the handle fixing member are arranged adjacent to each other and can be operated by a finger gripping the grip portion.

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