JP2013050084A - Handheld working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a handheld working machine which enables a user to operate an output control mechanism without releasing a hand holding a grip part to enhance its working efficiency.SOLUTION: The control grip 142 of the output control mechanism 140 is provided between a first throttle lever 120 and the holding part 111. Thus the control grip 142 can be controlled with the finger of the hand while holding the holding part 111, and the output control mechanism 140 enables the user who holds a bush cutter 1 to control the control grip 142 without releasing the hand from the holding part 111.

Description

  The present invention relates to a hand-held work machine such as a brush cutter, a chain saw, a power blower, or the like.

  Conventionally, as this type of hand-held work machine, for example, a machine equipped with a fixed output adjusting means capable of fixing a throttle lever for adjusting the output of the engine at the time of operation to an arbitrary position is known. . In a hand-held work machine having a fixed output adjusting means, the throttle lever is fixed at an arbitrary position, so that there is an advantage that the work can be performed while maintaining a constant output. However, with the fixed output adjustment means, even if the hand-held work machine is released during the operation, the engine continues to operate at a constant output unless the throttle lever is operated to return the engine to the idle operation state. Therefore, there is a possibility that ensuring safety is insufficient.

  On the other hand, as an output adjustment means different from the hand-held work machine, the engine output is adjusted only while the user operates the throttle lever, and when the user releases his hand from the throttle lever, the engine There is known a trigger type output adjusting means which is in an idle operation state. The trigger type output adjusting means is highly safe because the engine is in an idle operation state when the user releases his / her hand from the throttle lever. However, the trigger-type output adjustment means keeps the engine output constant because the throttle lever is not fixed when the engine is operated with a so-called half throttle between the idle operation state and the maximum output operation. Is difficult. For this reason, in a hand-held work machine equipped with a trigger-type output adjusting means, the user operates the engine at the maximum output, and noise and vibration are generated more than necessary, and fuel consumption increases. There is a problem.

  Therefore, as an output adjusting means capable of solving the above-mentioned problems, the gripping part that the user grips at the time of use, and one end side is rotatably supported by the gripping part, and the other end is touched by the finger of the hand gripping the gripping part. A first throttle lever capable of adjusting the output of the engine by performing an operation of moving to the gripping portion side, and one end side is rotatably supported by the gripping portion between the gripping portion and the first throttle lever, and the gripping portion The second throttle lever that can adjust the output of the engine by moving the other end side to the grip side with the finger of the hand that holds the handle, and the second throttle lever moved to the grip portion side to the maximum An output adjustment mechanism that adjusts the output of the engine is known (see, for example, Patent Document 1). In this output adjustment means, the user can operate the engine at the maximum output without causing the engine to operate at the maximum output even by continuing the operation of moving the second throttle lever to the grip portion side as much as possible. The work can be performed while holding. Thereby, in the hand-held work machine provided with the output adjusting means, it is possible to prevent generation of noise and vibration more than necessary and to reduce fuel consumption.

JP 2005-226477 A

  In the hand-held work machine capable of solving the above-described problems, the second throttle lever is moved to the grip portion side to the maximum by adjusting the position of the second throttle lever with respect to the first throttle lever by the output adjustment mechanism. The engine output is adjusted. In this output adjusting means, a screw-shaped adjusting knob for connecting the first throttle lever and the second throttle lever is provided on the outside of the first throttle lever. For this reason, the user holding the hand-held work machine must operate the adjustment knob with at least one hand away from the gripping part in order to adjust the engine output by operating the second throttle lever. Therefore, it is difficult to improve operability, and work efficiency cannot be improved.

  An object of the present invention is to provide a hand-held work machine capable of operating an output adjustment mechanism and improving work efficiency without releasing a hand holding a holding part. .

  In order to achieve the above object, the present invention includes a working unit, a driving source that drives the working unit, a gripping unit that a user grips during use, and an output adjustment unit that adjusts the output of the driving source. In the hand-held work machine, the output adjusting means is rotatably supported at one end side by the member on the gripping portion and biased in a rotating direction in which the other end side is separated from the gripping portion. A first lever capable of arbitrarily adjusting the output of the drive source by performing an operation of moving the other end side to the gripping portion side with a gripped hand; and the gripping portion between the gripping portion and the first lever. Arranged between the first levers, one end side is rotatably supported by a member on the gripping part side, and the other end side is biased in a turning direction away from the gripping part to grip the gripping part. Move the other end side to the gripping part by hand. The output of the drive source in a state in which the second lever that can adjust the output of the drive source by performing and an output adjustment operation unit, and the second lever is moved to the gripping portion side to the maximum, is output. An output adjustment mechanism that adjusts arbitrarily by operating the adjustment operation unit, and the output adjustment operation unit is provided between the gripping unit and the first lever.

  As a result, the output adjustment operation unit can be operated with the fingers of the hand in the state of gripping the gripping unit, so that the user who grips the handheld work machine can adjust the output adjustment mechanism without releasing the hand from the gripping unit. Is possible.

  According to the present invention, it is possible to adjust the output adjustment mechanism without the user holding the handheld work machine releasing his / her hand from the gripping portion, so that the work efficiency can be improved.

It is a perspective view of a brush cutter provided with the output adjustment device which shows one Embodiment of this invention. It is a side view of an output adjustment device. It is a front view of an output adjustment device. It is a rear view of an output adjustment device. It is side surface sectional drawing of the output adjustment apparatus which shows the method of adjusting the output of the engine by operation of a 2nd throttle lever. It is sectional drawing of the output adjustment apparatus which shows the method of adjusting the output of the engine by operation of a 1st throttle lever. It is sectional drawing of the output adjustment apparatus which shows the state which each operated the 1st throttle lever and the 2nd throttle lever to the maximum. (A) The side view of the output adjustment apparatus which shows operation of a lock lever, (b) It is sectional drawing of the output adjustment apparatus which shows operation of a lock lever. (A) The side view of the output adjustment apparatus which shows operation of a lock lever, (b) It is sectional drawing of the output adjustment apparatus which shows operation of a lock lever.

1 to 9 show an embodiment of the present invention.
In this embodiment, an engine-driven brush cutter will be described as an example of the hand-held work machine of the present invention.

  As shown in FIG. 1, the brush cutter 1 includes an operation rod 2 extending in the front-rear direction, an engine 3 as a drive source connected to the rear end side of the operation rod 2, and a gear head 4 on the front end side of the operation rod 2. And a disk-shaped cutting blade 5 attached so as to be freely rotatable via the.

  The operation rod 2 has a drive shaft (not shown) rotatably provided therein. The engine 3 is connected to the rear end side of the drive shaft. A gear head 4 is connected to the front end side of the drive shaft.

  A handle 6 for a user to hold and operate the brush cutter 1 is provided on the slightly rear end side of the central portion of the operation rod 2. The handle 6 is made of a tubular member, extends from the operating rod 2 to both sides in the width direction, and is curved so that both end portions face upward. Grips 7 </ b> L and 7 </ b> R are provided at both ends of the handle 6 so that the user can hold it with the left and right hands. The right grip 7R is provided with an output adjusting device 100 as output adjusting means for adjusting the output of the engine 3 while being held by the user. The output of the engine 3 is adjusted by adjusting the valve opening degree of a throttle valve (not shown) provided in the engine 3.

  As shown in FIGS. 2 to 4, the output adjusting device 100 includes a device main body 110 that the user holds with the right hand, and a first throttle lever 120 as a first lever that can be operated to maximize the output of the engine 3. And a second throttle lever 130 as a second lever that is provided between the apparatus main body 110 and the first throttle lever 120 and can be operated to make the output of the engine 3 a predetermined output smaller than the maximum. The output adjustment mechanism 140 for adjusting the maximum output by the operation of the second throttle lever 130, the stop switch 150 for forcibly stopping the engine 3, the first throttle lever 120 and the second throttle lever 130 are set in a predetermined manner. And a half-lock mechanism 160 for fixing at the operation position.

  The apparatus main body 110 is formed in a hollow, substantially cylindrical shape that extends in the vertical direction along the end of the handle 6, and the upper side protrudes forward. On the lower side of the apparatus main body 110, a grip portion 111 that is gripped with the right hand of the user is provided as the grip 7R. On the upper portion of the grip portion 111, a collar portion 111a extending radially outward along the circumferential direction is provided except for a portion where the thumb of the hand gripping the grip portion 111 is adjacent. In addition, in the portion where the thumb of the hand holding the grip 111 is adjacent, a notch surface 111b is provided so that the thumb of the user's hand holding the grip 111 can move on the upper side of the grip 111. Is provided. A first throttle lever 120 and a second throttle lever 130 are supported on the upper side of the apparatus main body 110, and a stop switch 150 and a half lock mechanism 160 are disposed. The apparatus body 110 is connected to a throttle wire 8 for adjusting the valve opening of the throttle valve. As shown in FIG. 5, the throttle wire 8 is passed through the apparatus main body 110 from the lower end side of the apparatus main body 110, the end of the outer 8a is fixed inside the grip portion 111, and the end of the inner 8b is The first throttle lever 120 is connected.

  The first throttle lever 120 is provided so as to extend in the vertical direction in front of the apparatus main body 110, and as shown in FIG. 5, the upper end side is within the predetermined range via the support shaft 121 on the upper end side of the second throttle lever 130. It is supported rotatably. The first throttle lever 120 has a torsion spring 122 wound around a support shaft 121 and is biased in a direction in which the lower end side of the first throttle lever 130 rotates forward. The first throttle lever 120 is operated in a direction in which the lower end side is moved to the gripping part 111 side by the index finger of the user's hand gripping the gripping part 111. The first throttle lever 120 is connected to the end of the inner end 8b of the throttle wire 8 at the end on the upper end side. When the first throttle lever 120 is rotated in the direction in which the lower end side is moved to the second throttle lever 130 side as much as possible, the first throttle lever 120 is superposed on the second throttle lever 130.

  The second throttle lever 130 is provided so as to extend in the vertical direction between the apparatus main body 110 and the first throttle lever 120, and as shown in FIG. And is rotatably supported within a predetermined range. The second throttle lever 130 has a torsion spring 132 wound around a support shaft 131, and is biased in a direction in which a lower end side thereof rotates forward with respect to the apparatus main body 110. The second throttle lever 130 is operated in a direction to move the lower end side to the gripping part 111 side by a finger of a user's hand gripping the gripping part 111. The second throttle lever 130 is formed such that the lower end side extends along the grip portion 111 in a state where the lower end side is rotated in the direction to move the lower end side to the grip portion 111 as much as possible. 130 can be held together by hand.

  As shown in FIG. 5, the output adjustment mechanism 140 connects the first throttle lever 120 and the second throttle lever 130 variably with each other. The output adjustment mechanism 140 is an adjustment that is inserted from the front of the through-hole 123 into the through-hole 123 that extends in the front-rear direction provided in the first throttle lever 120 and the through-hole 133 that extends in the front-rear direction provided in the second throttle lever 130. It has a bolt 141 and an adjustment knob 142 as an output adjustment operation part provided to be rotatable with respect to the second throttle lever 130. The adjustment knob 142 is a cylindrical member having an outer peripheral surface formed with unevenness to prevent slipping when operated with a finger, and an internal thread is cut on the inner peripheral surface. The adjustment knob 142 is screwed on a male screw provided on the adjustment bolt 141. The second throttle lever 130 is supported in the combined state. The adjustment knob 142 is exposed on both sides of the second throttle lever 130 in the width direction, and can be operated from one or both sides of the second throttle lever 130 in the width direction.

  When the stop switch 150 is operated during the operation of the engine 3, for example, the supply of power to the ignition coil is cut off and the engine 3 is stopped. As shown in FIGS. 2 and 4, the stop switch 150 is provided above the grip portion 111 of the apparatus main body 110 and on the overhanging section 112 that protrudes leftward from the rear side of the left surface of the apparatus main body 110. Yes. The stop switch 150 is a push button type switch, and the surface to be pressed is arranged rearward. The stop switch 150 can be operated by moving the thumb of the user's hand in a state of gripping the grip portion 111 upward. In addition, a wiring passage 113 formed so as to project outward toward the second throttle lever 130 side is provided on the lower surface side of the projecting portion 112, and the wiring of the stop switch 150 is passed therethrough.

  As shown in FIG. 2, the half-lock mechanism 160 is provided above the grip portion 111 and on the left side of the apparatus main body 110. As shown in FIGS. 8 and 9, the half-lock mechanism 160 is provided inside the apparatus main body 110, and a lock lever 161 provided on the outer surface of the apparatus main body 110 and having one end rotatably supported by the apparatus main body 110. And a torsion spring 163 that urges the lock lever 161 and the lock member 162 in a direction to release the half-lock state. The lock lever 161 is a member whose other end extends radially outward from the center of rotation. The lock lever 161 pivots between an unlocked state with the other end facing forward as shown in FIG. 8 (a) and a half-locked state facing upward as shown in FIG. 9 (a). It is provided freely. The lock member 162 is a disk-like member having a pivot shaft of the lock lever 161 connected to the center, and the contact piece 162a with which the contact surface 124 provided at the upper end portion of the first throttle lever 120 contacts is an outer periphery. It extends from the portion in the direction in which the rotation shaft extends. The torsion spring 163 is wound around the lock member 162 and biases the lock lever 161 and the lock member 162 in a rotational direction in which the lock member 162 releases the half-locked state.

  The operation method of the normal output adjustment apparatus 100 when performing the work by the brush cutter 1 in the handheld working machine configured as described above will be described.

  First, in a normal operation, when the engine 3 is in an idling state, an operation is performed to move the second throttle lever 130 toward the grip portion 111 in the direction of the arrow in FIG. Move to the gripping part 111 side. Here, since the first throttle lever 120 and the second throttle lever 130 are connected by the adjustment bolt 141 of the output adjustment mechanism 140, the first throttle lever 120 also moves to the gripper 111 side together with the second throttle lever 130. . As a result, the inner 8b of the throttle wire 8 connected to the upper end of the first throttle lever 120 is drawn upward with respect to the outer 8a. At this time, the throttle wire 8 becomes an operation amount corresponding to the operation amount of the first throttle lever 120 that moves together with the second throttle lever 130, and becomes an output of the engine 3 corresponding to the operation amount of the throttle wire 8.

  Further, when the brush cutter 1 is operated by operating the second throttle lever 130, when the load applied to the cutting blade 5 is large, such as when cutting away dense vegetation, the second throttle lever 130 and the grip portion 111 are moved. While holding together, an operation of moving the first throttle lever 120 toward the grip portion 111 in the direction of the arrow in FIG. 6 is performed. Thereby, the inner 8b of the throttle wire 8 connected to the end portion on the upper end side of the first throttle lever 120 is further drawn upward with respect to the outer 8a. When the first throttle lever 120 is moved to the gripping portion 111 as much as possible, as shown in FIG. 7, the operation amount of the throttle wire 8 is maximized and the output of the engine 3 is maximized.

  Here, when adjusting the maximum output by the operation of the second throttle lever 130 of the engine 3, an operation of rotating the adjustment knob 142 of the output adjustment mechanism 140 is performed. When the adjustment bolt 141 is moved in a direction in which the head of the adjustment bolt 141 moves away from the adjustment knob 142, the first throttle lever 120 moves in a direction away from the grip portion 111 side by the biasing force of the torsion spring 122. As a result, the throttle wire 8 has its inner 8b returned downward relative to the outer 8a, and the output of the engine 3 is reduced. Further, when the adjustment bolt 141 is moved with respect to the adjustment knob 142 in the direction in which the head of the adjustment bolt 141 approaches, the first throttle lever 120 approaches the grip portion 111 side against the biasing force of the torsion spring 122. Move in the direction. As a result, the throttle wire 8 has its inner 8b drawn upward with respect to the outer 8a, and the output of the engine 3 is increased.

  The adjustment knob 142 of the output adjustment mechanism 140 is disposed between the first throttle lever 120 and the second throttle lever 130. Further, the adjustment knob 142 is disposed at a position where it can be operated by the thumb of the user's hand or the index finger with the grip 111 and the second throttle lever 130 held together. Thereby, the adjustment knob 142 can be operated without releasing the hand from the brush cutter 1 and without changing the hand that holds the grip portion 111.

  Further, by operating half-lock mechanism 160, the opening of the throttle valve can be opened more than in the idling state, and engine 3 can be started easily.

  When operating the lock lever 161 in a half-locked state, as shown in FIG. 8, the end of the lock lever 161 is moved upward while the second throttle lever 130 is operated by a predetermined amount toward the grip portion 111. Rotate to face Thereafter, the hand is released from the second throttle lever 130 with the end of the lock lever 161 facing upward. At this time, the contact piece 162a of the lock member 162 is located on the upper side, and when the hand is released from the second throttle lever 130, the torsion spring 163 of the half lock mechanism 160 and the torsion spring 132 of the second throttle lever 130 are released. The state where the contact surface 124 of the first throttle lever 120 is in contact with the urging force is maintained. As a result, as shown in FIG. 9, the first throttle lever 120 and the second throttle lever 130 are in a half-locked state.

  In order to release the half-locked state, the first throttle lever 120 or the second throttle lever 130 is moved toward the grip 111 as shown by the arrow in FIG. As a result, the contact between the contact piece 162a of the lock member 162 and the contact surface 124 of the first throttle lever 120 is released, and the lock lever 161 is brought into contact with the contact piece 162a of the lock member 162 by the biasing force of the torsion spring 163. Is rotated in the direction of moving forward, and the half-lock state is released.

  As described above, in the hand-held work machine of the present embodiment, the adjustment knob 142 of the output adjustment mechanism 140 is provided between the first throttle lever 120 and the grip portion 111. As a result, the adjustment knob 142 can be operated with the finger of the hand in the state of gripping the grip portion 111, so that the output adjustment mechanism 140 can be used without the user holding the brush cutter 1 releasing the hand from the grip portion 111. The adjustment knob 142 can be adjusted. Therefore, the work efficiency of the work by the brush cutter 1 can be improved.

  Further, the adjustment knob 142 can be operated by the hand gripping the grip portion 111 while the lower end side of the second throttle lever 130 is moved to the grip portion 111 side as much as possible. Thereby, while performing the operation by operating the second throttle lever 130, the output of the engine 3 can be adjusted according to the operation to be performed, and the work efficiency of the operation by the brush cutter 1 can be improved.

  Further, a flange 111a extending outward in the circumferential direction on the upper side of the grip 111 is provided except for a portion adjacent to the thumb of the hand gripping the grip 111, and the thumb of the hand gripping the grip 111 The notch surface 111b is provided in the part which adjoins. As a result, the thumb of the hand holding the grip 111 can be easily moved above the grip 111 so that the adjustment knob 142 can be operated by the thumb of the hand holding the grip 111. It becomes easier and adjustment work of the output adjustment mechanism 140 becomes easier.

  Further, the stop switch 150 is provided on the overhanging portion 112 that protrudes leftward from the rear side of the left surface of the device main body 110 above the grip portion 111 of the device main body 110. As a result, it is possible to reduce erroneous operations in which the stop switch 150 is erroneously operated during work.

  Further, the lock lever 161 of the half lock mechanism 160 is provided above the grip portion 111 of the apparatus main body 110 and at a position adjacent to the overhang portion 112 between the overhang portion 112 and the second throttle lever 130. ing. As a result, the lock lever 161 is positioned adjacent to the front of the overhanging portion 112, so that the thumb of the hand holding the grip portion 111 can hardly reach the lock lever 161. The lock lever 161 is not operated. Therefore, the half lock mechanism 160 can function only as a starting device, so that the safety of the brush cutter 1 can be improved.

  In addition, the lock lever 161 is rotatably supported at one end side by the apparatus main body 110, and the other end side is urged by a torsion spring 163 in the rotation direction to release the locked state, and the other end side is a second throttle lever. A half-locked state is obtained by rotating the state toward the overhanging portion 112 from the state toward the 130 side toward the upper side. Accordingly, the half-lock state is achieved by the operation of rotating the end portion of the lock lever 161 in the direction away from the thumb, so that it is possible to reduce erroneous operations that erroneously enter the half-lock state during work.

  Further, the wiring passage 113 of the stop switch 150 is formed so as to project outward from the projecting portion 112 toward the second throttle lever 130. As a result, since the wiring passage 113 becomes a wall provided on the lower surface of the overhanging portion 112, the thumb of the hand gripping the grip portion 111 is more difficult to reach the lock lever 161, and the half lock state is accidentally caused during the work. Incorrect operation can be reduced.

  In the above embodiment, the brush cutter 1 according to the present invention is shown as an example of a hand-held work machine, but the present invention is not limited to this. As other handheld work machines to which the present invention can be applied, the present invention can be applied to handheld work machines such as chainsaws and power blowers.

  In the above embodiment, the drive source that adjusts the output of the engine 3 is shown as the drive source that adjusts the output. However, the present invention is not limited to this. As long as the output is adjusted by the first throttle lever 120 and the second throttle lever 130, the present invention can be applied even if the drive source is an electric motor.

  DESCRIPTION OF SYMBOLS 1 ... Brush cutter, 3 ... Engine, 100 ... Output adjusting device, 110 ... Apparatus main body, 111 ... Holding part, 112 ... Overhang | projection part, 113 ... Wiring path, 111a ... Gutter part, 111b ... Notch surface, 120 ... 1st DESCRIPTION OF SYMBOLS 1 throttle lever, 121 ... spindle, 130 ... 2nd throttle lever, 131 ... spindle, 140 ... output adjustment mechanism, 142 ... adjustment knob, 150 ... stop switch, 160 ... half lock mechanism, 161 ... lock lever.

Claims (7)

In a hand-held work machine having a working unit, a drive source that drives the working unit, a gripping unit that a user grips during use, and an output adjustment unit that adjusts the output of the drive source,
The output adjusting means includes
One end side is rotatably supported by the member on the gripping portion side, and the other end side is biased in a turning direction away from the gripping portion, and the other end side is held on the gripping portion side by a hand holding the gripping portion. A first lever capable of arbitrarily adjusting the output of the drive source by performing an operation of moving to
Between the grip part and the first lever, it is disposed between the grip part and the first lever, and one end side is rotatably supported by a member on the grip part side, and the other end side is from the grip part. A second lever that is biased in a turning direction to be separated and that can adjust the output of the drive source by performing an operation of moving the other end side to the gripping portion side with a hand gripping the gripping portion;
An output adjustment mechanism that has an output adjustment operation unit and arbitrarily adjusts the output of the drive source in a state in which the second lever is moved to the gripping part side to the maximum by operating the output adjustment operation unit. ,
The output adjustment operation part is provided between the grip part and the first lever. 2. The hand-held type according to claim 1, wherein the output adjustment operation unit can be operated by a hand holding the grip unit in a state where the second lever is moved to the grip unit side to the maximum. Work machine. The grip portion is provided with a flange extending outward along the circumferential direction of the grip portion, except for a portion adjacent to the thumb of the hand that grips the grip portion,
The handheld work machine according to claim 1 or 2, wherein a notch surface is provided in a portion adjacent to the thumb. An overhanging portion that protrudes from the notch surface is provided on one end side in the axial direction from the flange portion of the gripping portion, and on the notch surface side of the gripping portion,
The hand-held work machine according to claim 3, wherein a driving stop button of a driving source is provided in the overhanging portion. When the drive source is an engine, a half-lock mechanism that locks the valve opening of a throttle valve provided in the engine in a half-throttle state,
The hand-held type according to claim 4, wherein the lock lever for operating the half-lock mechanism is provided at a position adjacent to the overhang portion between the overhang portion and the second lever. Work machine. The lock lever is
One end side is rotatably supported by the member on the grip portion side, and the other end side is urged in a turning direction to release the locked state at the half throttle,
The locked state is obtained by rotating the other end side from the state facing the second lever side to the projecting portion side so as to pass in the direction of the one end side of the gripping portion. The hand-held work machine described in 1. The handheld work machine according to any one of claims 4 to 6, wherein a path for wiring of the drive stop button is formed to project outward from the projecting portion toward the second lever.

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