JP6499013B2 - Working machine - Google Patents

Description

  The present invention relates to a working machine in which an operator grips a work tool driven by a prime mover, and the gripper is operated by pulling the grip to a position where it can be operated by the operator's fingers. The present invention relates to a work machine that is provided with a trigger lever that can be rotated.

  Patent Document 1 discloses a chain saw provided with a saw chain driven by a prime mover. This chain saw includes an electric motor that is a prime mover in a housing, a guide bar that protrudes forward at the front of the housing, and a saw chain that is stretched around the guide bar and driven by the electric motor. ing. The chain saw is used for cutting wood or the like by rotating the saw chain along the outer periphery of the guide bar by driving with an electric motor. This chain saw is provided with a side handle at the center in the front-rear direction of the housing and a rear handle at the rear of the housing. For example, the operator grips the grip at the top of the side handle with the left hand and the grip at the top of the rear handle with the right hand. Grab the wood and cut wood. A trigger lever is rotatably provided on the lower surface of the grip of the rear handle, and the electric motor operates by pulling the trigger lever toward the grip.

Japanese Patent Laying-Open No. 2015-074193

  In the above chainsaw, the operator grips the grip at the top of the rear handle with the right hand from above, and pulls the trigger lever provided on the bottom surface of the grip of the rear handle with the index finger of the gripped right hand to the grip side. Thus, the electric motor is driven to rotate the saw chain. The trigger lever is pivotally supported so as to be rotatable between a rotation start position at which the operation surface portion operated by an index finger or the like of the gripped hand is farthest from the grip and a rotation end position closest to the grip. When the trigger lever is pulled by, for example, the index finger, the index finger joint is bent from the extended index finger and the grip is gripped like the other fingers. At this time, the index finger moves linearly in a direction perpendicular to the grip axis direction, but the operation point corresponding to the index finger on the operation surface portion of the trigger lever at the rotation start position is rotated to the rotation end position. Since the trajectory at the time is an arc shape, the operation direction connecting the operation point at the rotation start position and the operation point at the rotation end position is orthogonal to the grip axis direction as well as the movement of the index finger. The operation direction may be tilted back and forth from the orthogonal direction. For this reason, if the index finger is placed on the operation surface of the trigger lever and the trigger lever is pulled, the direction of pulling the index finger does not match the operation direction of the operation point on the operation surface of the trigger lever, and the index finger moves the operation surface of the trigger lever. There was a problem that the feeling of operation of the finger pulling the trigger lever was not good. Also, when the operation surface portion of the trigger lever is rotated from the rotation start position to the rotation end position by the index finger, the index finger is operated if the operation surface portion at the rotation end position is not parallel to the grip axis direction. There was a problem that the feeling of operation of the finger pulling the trigger lever was not good because the surface portion was slipped. An object of this invention is to improve the operation feeling of the trigger lever rotatably provided in the grip of the working machine.

  In order to solve the above-described problems, the present invention is a working machine that includes a working tool driven by a prime mover, in which the worker grips the grip by hand and works by the working tool. The trigger lever that drives the prime mover by pulling it to the grip side with a finger is provided so as to be able to rotate, and the trigger lever is rotated so that the operation surface part that is operated to pull to the grip side by the operator's finger is the furthest away from the grip Between the start position and the rotation end position closest to the grip, it is pivotally supported around the rotation shaft portion, and is operated by the finger of the operation surface portion of the trigger lever at the rotation start position. Provided is a working machine characterized in that a rotation shaft portion is arranged so that an operation direction connecting an operation point and an operation point when rotated to a rotation end position is orthogonal to an axis direction of a grip. is there.

  In the working machine configured as described above, an operation direction that connects an operation point operated by a finger on the operation surface portion of the trigger lever at the rotation start position and an operation point when rotated to the rotation end position. The rotating shaft portion was arranged so that is perpendicular to the axial direction of the grip. As a result, the operation direction of the operation point operated by the finger on the operation surface portion of the trigger lever becomes the same direction as the direction of bending and pulling the finger joint corresponding to the operation point of the operation surface portion. The touched fingers are prevented from slipping on the operation surface, and the operation feeling when pulling the trigger lever can be improved.

  In the working machine configured as described above, it is preferable that the operation surface when the trigger lever is rotated to the rotation end position is parallel to the axial direction of the grip. When this is done, when the operator operates the work tool driven by the prime mover while pulling the trigger lever to the rotation end position with the hand holding the grip, the operation surface of the trigger lever is in the axial direction of the grip. Due to the parallelism, the finger pulling the trigger lever is less likely to slip on the operation surface, and the operation feeling when pulling the trigger lever can be improved.

Another working machine disclosed in the present specification is a working machine that includes a working tool that is driven by a prime mover, in which the worker grips the grip by hand and works by the working tool. A trigger lever that drives the prime mover by pulling it toward the grip side with a finger is provided so that the trigger lever can be operated by pulling it toward the grip side with the operator's finger. The operation surface when the trigger lever is rotated to the rotation end position is pivotally supported around the rotation shaft portion between the movement start position and the rotation end position closest to the grip. It is characterized by being parallel to the grip axial direction .

  In the working machine configured as described above, the operation surface when the trigger lever is rotated to the rotation end position is parallel to the axial direction of the grip. As a result, when the operator operates the work tool driven by the prime mover while pulling the trigger lever to the rotation end position with the hand holding the grip, the operation surface portion of the trigger lever becomes parallel to the grip axial direction. Therefore, the finger pulling the trigger lever becomes difficult to slide on the operation surface portion, and the operation feeling when pulling the trigger lever can be improved.

It is a perspective view of the chainsaw which is one Embodiment of the working machine of this invention. It is a side view of FIG. It is an exploded view which shows the rear part of a housing, and the inside of a rear handle, and is an exploded view when a trigger lever is in a rotation start position (a), and when it is in a rotation end position (b). FIG. 3 is an enlarged view of the rear part of FIG. 2.

  Hereinafter, a chain saw as an embodiment of the working machine of the present invention will be described with reference to the drawings. The chain saw 10 includes a saw chain 25 as a work tool driven by a prime mover 21 made of an electric motor, and a worker holds a grip 31 of a rear handle 30 and cuts wood with the saw chain 25. .

  As shown in FIGS. 1 and 2, the chainsaw 10 includes a prime mover 21 in the front portion of the housing 11 and a detachable battery pack 22 used as a power source for the prime mover 21 in the rear portion of the housing 11. A guide bar 23 that protrudes forward is provided on the front side of the right side surface of the housing 11. A drive shaft 21a that rotates by driving the prime mover 21 protrudes behind the guide bar 23 at the front side of the right side surface of the housing 11, and a sprocket 24 is fixed to the drive shaft 21a. A saw chain 25 is stretched between the outer periphery of the guide bar 23 and the sprocket 24, and the saw chain 25 rotates on the outer periphery of the guide bar 23 by the sprocket 24 that is rotated by driving the prime mover 21. A sprocket cover 26 is provided on the front side of the right side surface of the housing 11, and the sprocket cover 26 covers the drive shaft 21 a of the prime mover 21, the sprocket 24, and the base end portions of the guide bar 23.

  As shown in FIGS. 1 and 2, a side handle (front handle) 27 is provided at an intermediate portion in the front-rear direction of the housing 11, and the side handle 27 has a substantially U-shape that is upside down. Yes. The upper part of the side handle 27 is a grip 28, and this grip 28 is used by an operator gripping from the upper side with, for example, the left hand (one hand).

  As shown in FIGS. 1 to 4, a rear handle 30 is integrally formed at the rear portion of the housing 11, and the rear handle 30 is substantially U-shaped so that the rear side is closed. An upper portion of the rear handle 30 is a grip 31 that is held by an operator with, for example, the right hand (the other hand). The grip 31 is used by being gripped from above by the operator with the right hand, and the palm of the right hand is applied to the upper surface and side surface of the grip 31.

  As shown in FIG. 3, a trigger lever 32 is provided on the lower surface of the front portion of the grip 31 so as to be rotatable about a horizontal axis in the left-right direction near the boundary with the rear portion of the housing 11. The trigger lever 32 drives the prime mover 21 according to the rotation angle. The trigger lever 32 has a rotation shaft portion 33 near the boundary between the upper portion of the grip 31 and the rear portion of the housing 11, and has a substantially sector shape that extends rearward around the rotation shaft portion 33. The trigger lever 32 is supported so that the rear side can pivot up and down around the pivot shaft 33. The lower surface of the trigger lever 32 is slightly curved downward from the middle portion in the front-rear direction to form a planar operation surface portion 34 that is operated by applying the finger of the operator (the lower surface of the trigger lever 32 in FIG. 3). The trigger lever 32 is used so that an operator's index finger, for example, is applied to the operation surface 34 and pulled toward the grip 31 (upper side). The trigger lever 32 has a rotation start position (shown in FIG. 3A) where the operation surface portion 34 is farthest from the grip 31 and a rotation end position where the operation lever 34 is closest to the grip 31 (shown in FIG. 3B). Is pivotally supported around the rotation shaft portion 33.

  The trigger lever 32 includes a switch pushing portion 35 that pushes the switch portion 29 of the prime mover 21 on the front side of the rotation shaft portion 33. When the trigger lever 32 is in the rotation start position, the switch pushing portion 35 is separated from the switch portion 29 and the switch portion 29 is off. When the operation surface portion 34 of the trigger lever 32 is pulled to the grip 31 side (upper side) so as to be the above-described rotation end position, the switch pushing portion 35 is rotated downward with the rotation shaft portion 33 as a fulcrum, and the switch The part 29 is pushed and the switch part 29 is turned on.

  As shown in FIG. 4, the operation surface 34 of the trigger lever 32 is operated by the operator's fingers. The operation point 34a is operated by the operator's fingers (the operation point 34a shown in FIG. The operation point 34a has a size of the operator's finger and may change in the front-rear direction of the operation surface 34 depending on the finger to be operated. The rotation start position (in FIG. 4 is the rotation start position). An operation point 34a when a certain trigger lever 32 is indicated by a solid line (in FIG. 4, the operation point 34a when it is in the rotation start position is indicated by 34a1) and a rotation end position (in FIG. 4, the rotation end) Operation for connecting the operation point 34a when the trigger lever 32 at the position is rotated to the two-dot chain line (in FIG. 4, the operation point 34a when the trigger lever 32 is at the rotation end position is indicated by 34a2) Direction OD is the axis of grip 31 It is arranged rotation shaft 33 so as to be perpendicular to the AD (axial direction at the center portion of the palm gripping the grip 31). Further, the lower surface of the trigger lever 32 is inclined downward as the operation surface portion 34 moves rearward from the other portions, and the operation surface portion 34 when the rotation end position is reached is parallel to the axial direction AD of the grip 31. It has become.

  When the chainsaw 10 configured as described above is used for cutting wood, the operator holds the grip 28 of the side handle 27 with the left hand, for example, and holds the grip 31 of the rear handle 30 with the right hand. At this time, the palm of the right hand of the operator hits the upper surface and the side surface of the grip 31 of the rear handle 30, and the fingers other than the thumb of the right hand hit the lower surface of the grip 31, and in particular, the index finger (which may be the index finger and middle finger) It touches the operation surface part 34. When the index finger of the right hand is pulled to the grip 31 side and the operation surface portion 34 of the trigger lever 32 is rotated from the rotation start position to the rotation end position, the switch pushing portion 35 of the trigger lever 32 pushes the switch portion 29. The prime mover 21 is driven when the switch unit 29 is turned on. The saw chain 25 is rotated around the outer periphery of the guide bar 23 by a sprocket 24 that is rotated by driving the prime mover 21, and the saw chain 25 that rotates around the outer periphery of the guide bar 23 is pressed against the outer periphery of the log or the like to cut the log or the like. To do.

  In the chain saw 10 configured in this manner, when the trigger lever 32 provided on the grip 31 on the upper part of the rear handle 30 is rotated to the operation point 34a1 of the operation surface 34 at the rotation start position and the rotation end position. The rotation shaft portion 33 is arranged so that the operation direction OD connecting the operation point 34 a 2 is orthogonal to the axial direction AD of the grip 31. Specifically, the operation point 34a1 at the rotation start position and the operation point 34a2 at the rotation end position are drawn from a parallel line (surface) parallel to the axial direction AD of the grip 31 from the rotation shaft portion 33. (Plane) The rotation shaft portion 33 is arranged so as to be a symmetrical position.

  When the index finger of the right hand holding the grip 31 of the rear handle 30 is applied to the operation surface portion 34 of the trigger lever 32, the index finger is bent and the trigger lever 32 is pulled, the index finger is orthogonal to the axial direction AD of the grip 31. Move in the direction. The operation direction OD of the operation point 34a operated by hitting the index finger of the operation surface portion 34 of the trigger lever 32 is the same as the direction of bending and pulling the joint of the index finger corresponding to the operation point 34a of the operation surface portion 34. Accordingly, even if the operator's index finger is applied to the operation surface portion 34 of the trigger lever 32 and rotated from the rotation start position to the rotation end position, the index finger does not slide on the operation surface portion 34, and the trigger lever 32 is The feeling of operation when pulling could be improved. In the present invention, the rotation shaft portion 33 is optimally arranged so that the operation direction OD connecting the operation points 34a1 and 34a2 at the rotation start position and the rotation end position is orthogonal to the axial direction AD of the grip 31. However, the present invention does not require that the operation direction OD is an orthogonal direction that is strictly orthogonal to the axial direction AD, and includes a range in which the operating direction OD is inclined at 0 ° to 5 ° from the axial direction AD. The above-described effects can be obtained even when this is done.

  Further, the operation surface portion 34 when the trigger lever 32 is rotated to the rotation end position is set to be parallel to the axial direction AD of the grip 31. Thus, when the wood is cut using the saw chain 25 rotated by the prime mover 21 with the trigger lever 32 pulled to the rotation end position with the index finger of the right hand holding the grip 31, the trigger lever Since the operation surface portion 34 of 32 is parallel to the axial direction AD of the grip 31, the index finger of the right hand pulling the trigger lever 32 becomes difficult to slide on the operation surface portion 34, and the operation feeling when pulling the trigger lever 32 is felt. It was possible to be good. It is optimal that the operation surface portion 34 when the trigger lever 32 is rotated to the rotation end position is parallel to the axial direction AD of the grip 31, but in the present invention, the operation surface portion 34 is strictly parallel to the axial direction AD. The operation surface portion 34 includes a range in which the operation surface portion 34 is inclined at 0 ° to 5 ° with respect to the axial direction AD, and the above-described effects can be obtained even in this case.

  In this embodiment, the operation direction connecting the operation point 34a1 operated by the finger of the operation surface portion 34 of the trigger lever 32 at the rotation start position and the operation point 34a2 when rotated to the rotation end position. The rotation shaft portion 33 is arranged so that the OD is orthogonal to the axial direction AD of the grip 31, and the operation surface portion 34 when the trigger lever 32 is rotated to the rotation end position is parallel to the axial direction AD of the grip 31. However, the present invention may be an invention that employs one of these, and only one of these can achieve the effect of improving the operational feeling.

  In the above embodiment, the electric motor is used as the prime mover 21, but the present invention is not limited to this, and the prime mover 21 may employ an engine composed of an internal combustion engine. In this case, any trigger wire connected to the throttle valve of the engine may be connected to the trigger lever 32 and the trigger valve 32 may be pulled to open the throttle valve to drive the prime mover 21. Even in this case, the same effect as described above can be obtained.

  In the above embodiment, the index finger is mainly described as the finger applied to the operation surface portion 34 of the trigger lever 32. However, the trigger lever 32 is pulled by applying the finger other than the index finger to the operation surface portion 34. Even in this case, the same effect as described above can be obtained.

  In the above embodiment, the chain saw in which the trigger lever is provided on the grip of the rear handle has been described as an embodiment of the work machine. However, the present invention is not limited to this, and the housing is provided as another embodiment of the work machine. A top handle type chain saw provided with a trigger lever on the top handle grip provided on the top of the support handle, provided with a rotary blade driven by a prime mover at the front end of the support rod, and a grip provided at the intermediate portion in the front-rear direction of the support rod A brush cutter provided with a trigger lever (may be provided directly on the support rod, or provided on a U-shaped or annular handle), driven forward and backward by a prime mover at the front of the housing A hedge trimmer equipped with a trimming blade, a trigger provided on the grip provided on the housing, and driven to the left and right by a prime mover at the front of the housing It is also applied to a working machine such as a lawn hair clipper provided with a lawn mowing blade and provided with a trigger lever on a grip provided on the housing, and the same action as described above when applied to these working machines An effect can be obtained.

 DESCRIPTION OF SYMBOLS 10 ... Work machine (chain saw), 21 ... Prime mover, 25 ... Work tool (saw chain), 31 ... Grip, 32 ... Trigger lever, 33 ... Rotating shaft part, 34 ... Operation surface part, 34a (34A1, 34a2) ... Operation Point, AD: axial direction, OD: operation direction.

Claims (2)

A working machine comprising a working tool driven by a prime mover, wherein an operator grips a grip by hand and works with the working tool,
The grip is provided with a trigger lever that drives the prime mover by pulling it toward the grip side with an operator's fingers.
The trigger lever rotates between a rotation start position at which an operation surface portion that is operated so as to be pulled toward the grip side by the operator's finger is farthest from the grip and a rotation end position that is closest to the grip. It is pivotally supported around the moving shaft,
When the grip and the trigger lever are viewed from the side, the operation point operated by the fingers of the operation surface portion of the trigger lever at the rotation start position and the operation point when rotated to the rotation end position Are arranged at positions symmetrical with respect to a straight line passing through the rotation shaft portion and parallel to the axis of the grip, and when the operation point is at the rotation start position and at the rotation end position. The working machine, wherein the rotating shaft portion is arranged so that an operation direction connecting the operation points is orthogonal to an axial direction of the grip. The working machine according to claim 1,
A work machine characterized in that the operation surface portion when the trigger lever is rotated to the rotation end position is parallel to the axial direction of the grip.

Images