JP4097383B2 - Handle apparatus and brush cutter using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a handle device and a brush cutter using the handle device, and more particularly to a safety mechanism for preventing malfunction when a grip member provided with an engine throttle portion is rotated.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a working machine for cutting branches and leaves, there is a brush cutter having a configuration in which a cutting blade is provided at a distal end portion of an operating rod.
As such a brush cutter, for example, a reciprocating blade type brush cutter in which a clearance is formed so as to cross the reciprocating direction of each blade on the joint surface between the upper blade and the lower blade which are relatively slid and driven to reciprocate. There is.
By the way, in the usage environment of the brush cutter, when the direction of the blade is adjusted with respect to the direction of the branches and leaves, the angle at which the grip operation unit at hand is gripped may be an angle that imposes a burden on the hand. For this reason, conventionally, a configuration has been proposed in which a handle portion including an engine throttle portion, which is a blade drive source, can be independently tilted on the center line in the reciprocating direction of the upper blade and the lower blade (for example, JP-A-3-117573).
In the above publication, assuming that the throttle lever is advanced into the gripping portion and the output of the drive source is changed by adjusting the amount of the throttle lever, the throttle lever is used as the driving source when rotating the gripping portion. The structure which can be hold | maintained in the initial position from which idle rotation is obtained is disclosed.
[0003]
[Problems to be solved by the invention]
However, with this configuration, there is a risk that the drive source is not completely stopped. That is, when the gripping portion is rotated in the idle rotation state, the member for maintaining the state is the movement path of the throttle lever, and in this publication, the throttle lever is a lever that swings when the hand is gripped. It is configured to advance in the movement path and regulate the swing of the throttle lever. For this reason, if it deviates from the rocking path for some reason, there is a risk that the cutting blade unexpectedly starts operating due to a force acting on the throttle lever accidentally when the gripping portion is rotated.
[0004]
The object of the present invention is the problem with the conventional brush cutter, particularly when the operation unit is configured to rotate independently with respect to the blade part, the risk that the blade part will be inadvertently driven during the rotation operation. It is in providing the grip member provided with the structure which can eliminate, and a brush cutter using the same.
[0005]
[Means for Solving the Problems]
The invention according to claim 1 is a grip device that is provided with a throttle portion that controls the output of the engine and can be gripped by hand, and is gripped by a hand and a portion to which a member to which the output of the engine is transmitted is connected. The part is divided into a main body that is relatively rotatable, a throttle member that is disposed on the part that is gripped by the hand, and that controls the output of the engine, and slides in a direction crossing the parting surface. rotatably in provided, comprising all times, a slide member biasing force so as to cross the dividing plane is provided, and an ignition switch of the engine which is arranged in a portion to be gripped by the hand, the sliding moving member is related to the adjustment state of the throttle member when the slide in a direction different from the member in which the output of the engine is transmitted from the divided surface against the biasing force is connected portion Ku turn off the ignition switch is characterized by forcibly stopping the engine.
[0006]
According to a second aspect of the invention, a brush cutter using the handle device according to claim 1, wherein said handle unit, the remaining portion corresponding to the portion to be gripped by the portion and the hand is connected to the cutting blade side The manual member is slidable in the direction crossing the opposing surfaces of the two parts and urged to cross the opposing surfaces in the remaining part, When the portion of the rotary members from the opposing surface is connected to the cutting blade side sliding a finger in different directions, and wherein said two portions becomes relatively pivotal rotation allowed capacity.
[0007]
[Action]
In the first aspect of the invention, since the sliding member always crosses the dividing surface of the main body, an inadvertent rotating operation in this state cannot be performed. Therefore, when rotating the main body, it is necessary to separate the sliding member from the dividing surface. At this time, the sliding member can forcibly stop the engine by turning off the ignition switch of the engine. Inadvertent rotation does not occur. As a result, the engine is always stopped when the opposite portion of the main body is rotated, so that the main body can be rotated extremely safely without unexpectedly increasing the rotational speed of the engine.
[0008]
In the invention according to claim 2, in the configuration in which the portion connected to the cutting blade side and the portion grasped by the hand are relatively rotatable, the ignition member is slid in a direction away from the dividing surface. since performed for the first time a relative rotation operation by turning off, set the safety conditions in conjunction confirmation and check its state where the rotation operation is performed, that is, it is possible to stop the engine, ensure the safety at the time of rotation operation kill at.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the illustrated examples.
1 and 2 are a plan view and a side view of a brush cutter having a grip device according to an embodiment of the present invention.
The brush cutter 1 includes a cutting blade 2, an engine 3 as a driving source thereof, and a grip device 4 and a reverse gripping portion 5 for supporting the brush cutter 1 by hand.
The engine 3 includes a power transmission unit 3A that can be interlocked with the output shaft, and the rotational output of the engine 3 is converted into a reciprocating force by a mechanism (not shown) and transmitted to the cutting blade 2.
The cutting blade 2 is of a reciprocating type in which a gap is formed on the joint surface between the upper blade and the lower blade that are relatively slid and driven to reciprocate so as to cross the reciprocating direction of each blade. .
[0010]
As will be described in detail later, the handle device 4 is gripped by a hand and includes a throttle adjustment portion of the engine 3 so that the engine 3 can be stopped and restarted and the throttle opening can be adjusted while gripping. ing.
As shown in FIG. 2, the auxiliary gripping part 5 is an arm whose base is fixed to the power transmission part 3 </ b> A, and is used as a part that supports the brush cutter 1 with the handle device 4. A guard plate 5A is provided on the side of the cutting blade 2 of the auxiliary gripping part 5 to prevent the cut branches and leaves from hitting the hand.
[0011]
The details of the handle device 4 are shown in FIGS.
In FIG. 3, the grip device 4 is, as shown in FIG. 3, a transmission side mounting portion 4 </ b> A that is a portion connected to a power transmission portion 3 </ b> A (see FIG. 2) that is a portion capable of transmitting engine output to the cutting blade 2. And the holding part 4B which is a part hold | gripped with a hand is divided | segmented, and it divides into the shape shown in FIG. 4, and the main body is comprised.
The transmission side mounting portion 4A and the gripping portion 4B are relatively rotatable by a rotating shaft 4C provided on the gripping portion 4B side and a bearing portion 4D of the transmission side mounting portion 4A into which the rotation shaft 4C is rotatably inserted. Has been.
An annular portion 4C1 having a diameter larger than that of the shaft portion is formed at the tip of the rotating shaft 4C, and is fitted into a concave annular portion 4D1 formed on the bearing 4D, so that it can be prevented from coming off in the axial direction. Yes.
Although not shown, the rotary shaft 4D is provided with a convex locking portion formed with a phase of 180 degrees in the circumferential direction, and this convex locking portion rotates a plurality of times within the same phase on the inner peripheral surface of the bearing 4C. By elastically engaging the fitting portion formed at a position where the corner can be set, it can be held at a position rotated in a plurality of stages within a range of 180 degrees as shown in FIG. 3B. ing. Such 180 degree rotation is determined in order to prevent twisting of the throttle cable C described later.
[0012]
The transmission side mounting portion 4A is formed with a fastening hole 4A1 of the power transmission portion 3A and a fastening hole 4A2 for integrating the transmission side mounting portions 4A in the half state, and a hand is inserted into the gripping portion 4B. A fastening hole 4B2 for integrating the space portion 4B1 for gripping and the gripping portions 4B in a halved state is formed.
[0013]
Inside the gripping part 4B, a throttle cable C is connected to one of the swinging ends and supported by the support shaft 6 so as to be swingable, and the support shaft 8 restricts the swinging of the trigger lever 7. A stopper lever 9 is provided, and a sliding member 10 is provided on a split surface (position indicated by symbol D in FIG. 4) between the transmission side mounting portion 4A and the gripping portion 4B.
The trigger lever 7 is a part that controls the rotation of the engine by adjusting the traction amount with respect to the throttle cable C. One end of the throttle cable C is connected to one of the swinging ends with the support shaft 6 as a boundary, and its vicinity. The amount of rocking can be adjusted by gripping with a hand. The other of the oscillating ends of the trigger lever 7 faces the engine start switch 11, and when the start switch 11 is in the off state, the sway amount is restricted by striking the start switch 11 so that the throttle cable C cannot be pulled. It has become. The start switch 11 is not limited to the operation state being set in conjunction with the trigger lever 7, and the engine is started and stopped by setting its own sliding position. It is also possible.
The stopper lever 9 is applied with an urging force that locks the trigger lever 7 at a position where the throttle cable C cannot be pulled by the string spring 12, and the urging force is released by the palm when the grip portion 4B is gripped. The trigger lever 7 is allowed to swing. That is, when the end portion 9 </ b> A facing the swing end of the trigger lever 7 hits the swing end of the trigger lever 7, the swing of the trigger lever 7 is restricted.
[0014]
The sliding member 10 is a member formed with a space portion 10A in which a leading end advances into a split surface D between the transmission side mounting portion 4A and the gripping portion 4B and a finger can be inserted into the rear end, and the gripping portion 4B. And a guide portion provided on the transmission side mounting portion 4A side so as to be slidable.
The tip of the sliding member 10 has a hook shape, and a coil spring capable of biasing the tip of the sliding member 10 in a direction crossing the dividing surface D between the portion and the dividing surface D wall portion on the grip portion 4B side. An elastic body 13 such as is arranged.
The sliding member 10 is brought into a state in which the sliding member 10 traverses the split surface D between the transmission-side mounting portion 4A and the grip portion 4B as a normal position by the biasing force of the elastic body 13, and the grip portion The tip can be separated from the dividing surface D by sliding toward the 4B side.
[0015]
An ignition switch 14 that is actuated when the distal end of the sliding member 10 is separated from the dividing surface D is disposed on the distal end side of the sliding member 10.
The ignition switch 14 is configured by a limit switch that stops the engine when sliding in a direction in which the tip of the sliding member 10 is separated from the dividing surface D.
[0016]
Since the present embodiment is configured as described above, the state shown in FIG. 4 is maintained when the handle device 4 is not rotated with respect to the cutting blade 2. That is, if the grip portion 4B of the grip device 4 is gripped, the trigger lever swing restriction by the stopper lever 9 is released and the throttle cable C can be pulled, but the transmission side mounting portion 4A. Since the tip of the sliding member 10 crosses the dividing surface D between the holding portion 4B and the gripping portion 4B, relative rotation of the portions 4A and 4B with the dividing surface as a boundary is prevented.
At this time, since the operation of the ignition switch 14 by the tip of the sliding member 10 is not performed, the engine 3 is idled unless the throttle cable C is pulled.
[0017]
When the handle device 4 is rotated with respect to the cutting blade 2, the state shown in FIG. That is, by pulling the sliding member 10 in the direction in which the tip is separated from the dividing surface D, both portions can rotate relative to each other with the dividing surface D between the transmission side mounting portion 4A and the gripping portion 4B as a boundary.
At this time, since the ignition switch 14 is turned off by the sliding member 10, the engine 3 stops. As a result, when the handle device 4 is rotated, an inadvertent speed increase of the engine does not occur, so that the angle can be changed safely in a state where the cutting blade 2 does not reciprocate unexpectedly. it can.
[0018]
According to the present embodiment, the rotation operation can be performed only when the engine 3 is stopped, and the engine stop and the rotation operation are not performed separately, but the operation can be performed at the same portion of the grip portion 4B. Because it is possible, both operations can be performed without mistake.
In the above embodiment, regarding the sliding of the sliding member 10, the moving direction is not specified with the direction of crossing and separating the dividing surface D, but the moving direction is not specified, but it can be moved horizontally or operated with a finger. In consideration, as shown by a two-dot chain line L in FIG. 5, it is possible to set the bending direction in accordance with the movement of the finger. 5 shows a state in which the tip of the sliding member 10 is separated from the dividing surface D by sliding in the horizontal direction.
[0019]
【The invention's effect】
According to the first aspect of the present invention, since the sliding member always crosses the dividing surface of the main body, an inadvertent rotating operation in this state cannot be performed. Therefore, when the main body is rotated, it is necessary to separate the sliding member from the divided surface. At this time, the sliding member turns off the ignition switch of the engine, so that an inadvertent rotation of the engine does not occur. As a result, the engine is always stopped when the opposite portion of the main body is rotated, so that the main body can be rotated extremely safely without unexpectedly increasing the rotational speed of the engine.
[0020]
According to the second aspect of the present invention, in the configuration in which the portion connected to the cutting blade side and the portion grasped by the hand are relatively rotatable, the sliding member is slid in a direction away from the dividing surface to thereby turn the ignition. Since the relative rotation operation can be performed for the first time by turning off the switch, it is possible to confirm that the rotation operation can be performed and to set the safe state in accordance with the confirmation, that is, the engine can be stopped. It can be secured.
[Brief description of the drawings]
FIG. 1 is a plan view of a brush cutter provided with a handle device according to an embodiment of the present invention.
2 is a side view of the brush cutter shown in FIG. 1. FIG.
3 is a diagram for explaining a usage state of the handle device of the brush cutter shown in FIG. 1, (A) is a side view, (B) is an arrow in the direction indicated by (B) in (A). FIG.
FIG. 4 is a cross-sectional view for explaining the internal structure of the handle device according to the embodiment of the present invention.
5 is a cross-sectional view for explaining one embodiment of the internal structure shown in FIG. 4. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Brush cutter 2 Cutting blade 3 Engine 3A Power transmission member 4 which is a member to which engine output is transmitted 4 Handle device 4A Transmission side mounting portion 4B Gripping portion 4B1 Space for inserting hand 4C Rotating shaft 4D Bearing 7 Trigger lever for throttle adjustment DESCRIPTION OF SYMBOLS 10 Sliding member 10A Space in which a finger can be inserted 13 Elastic body 14 Ignition switch D Dividing surface

Claims (2)

A handle device that can be gripped by hand with a throttle portion that controls engine output,
A main body in which a portion to which a member to which the output of the engine is transmitted is connected and a portion to be gripped by a hand are divided, and whose divided surface is relatively rotatable;
A throttle member that is disposed in a portion gripped by the hand and controls the output of the engine;
A sliding member provided so as to be slidable in a direction crossing the dividing surface, and constantly applied with an urging force so as to cross the dividing surface;
And a ignition switch of the engine which is arranged in a portion to be gripped by the hand,
Regardless of the adjustment state of the throttle member, the sliding member slides in a direction different from the portion where the member to which the output of the engine is transmitted from the split surface is resisted against the biasing force. A handle apparatus for forcibly stopping the engine by turning off the ignition switch. A brush cutter using the handle device according to claim 1,
The handle apparatus, the remaining portion corresponding to the portion to be gripped by the portion and the hand is connected to the cutting blade side are arranged to be relatively rotated, the sliding member to the remainder of the above-Car It is slidable in a direction crossing the opposing surface of the part , and is urged to cross the opposing surface, and the sliding member is moved in a direction different from the part connected to the cutting blade side from the opposing surface. When sliding a finger, brush cutter, characterized in that the two portions becomes relatively pivotal rotation allowed capacity.

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