Work machine

Abstract

To provide a work machine relatively easily operated by unlocking a trigger lever by one hand.SOLUTION: The work machine includes a trigger lever 71, a lock-out lever, and a regulation unit. The trigger lever includes: a trigger lever body rotatably fitted to a body case; and an operation part provided so as to be displaceable with respect to the trigger lever body and having a protrusion positioned inside the body case. When an external force directed toward the body case is applied to the trigger lever body protruded from the body case and set at an initial position before the application of the external force, the protrusion of the operation part touches the regulation unit, and the trigger lever body touches the lock-out lever, thus blocking rotation of the trigger lever body with respect to the body case. When the work machine is seen in a normal direction of a flat surface in a state where the work machine is placed on the flat surface, the rotation center of the trigger lever body overlaps a power switch 46.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a work machine. [Background technology]

[0002] A handheld gardening tool (working machine) used for pruning hedges and plants is known (see Patent Document 1). This handheld gardening tool has a switching assembly for controlling the drive and stop of the tool. The switching assembly includes a trigger having an operating surface formed thereon, and a first operating member switchable between a first position and a second position, the first operating member at least partially protruding from the operating surface when in the first position to restrict movement of the trigger, and allowing movement of the trigger when in the second position.

[0003] The handheld gardening tool also includes a second operating member that can limit movement of the trigger. The second operating member is switchable between a third position and a fourth position relative to the trigger, and limits movement of the trigger when the second operating member is in the third position and allows movement of the trigger when the second operating member is in the fourth position. The trigger, first operating member, and second operating member are arranged on a single operating lever, but given their relative positions, it is difficult to operate them simultaneously while holding the operating lever with one hand. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Chinese Utility Model No. 208572785 Summary of the Invention [Problem to be solved by the invention]

[0005] In view of the above circumstances, the present invention aims to provide a work machine that can be operated relatively easily by unlocking the trigger lever with one hand. [Means for solving the problem]

[0006] According to one aspect of the present invention, a work machine is provided. The work machine includes a working unit configured to cut a work object and a main body connected to the working unit. The main body has a main body case, an operating mechanism, and a power switch attached to the main body case. The operating mechanism includes a trigger lever configured to control the operation of the working unit, a lockout lever displaceable relative to the trigger lever, and a restricting portion that restricts the position of the trigger lever relative to the main body case. The trigger lever includes a trigger lever main body rotatably attached to the main body case and an operating portion displaceable relative to the trigger lever main body and including a protrusion located inside the main body case. When an external force is applied to the trigger lever main body, which protrudes from the main body case and is in an initial position before the external force is applied, in a direction toward the main body case, the protrusion of the operating portion contacts the restricting portion and the trigger lever main body contacts the lockout lever, thereby preventing the trigger lever main body from rotating relative to the main body case. When the work machine is placed on a flat surface and viewed from a direction normal to the flat surface, the center of rotation of the trigger lever main body overlaps with the power switch.

[0007] According to this aspect, the trigger lever can be unlocked with one hand, allowing the working machine to be operated relatively easily. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. 2 is a side view showing the state in which the left cover of the main body is removed. [Figure 5] FIG. 4 is a perspective view showing the relationship between a restricting portion and an operating portion. [Figure 6] 10A and 10B are diagrams illustrating states of an operation mechanism. [Figure 7] 10A and 10B are diagrams illustrating states of an operation mechanism. [Figure 8] 10A and 10B are diagrams illustrating states of an operation mechanism. [Figure 9] 10A and 10B are diagrams illustrating states of an operation mechanism. [Figure 10] 10A and 10B are diagrams illustrating states of an operation mechanism. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of a chainsaw, which is an example of a work machine, will be described with reference to the accompanying drawings. Various features shown in the following embodiment can be combined with each other. Fig. 1 is a left side view of the chainsaw. Fig. 2 is a top view of the chainsaw. Fig. 3 is a perspective view of the chainsaw. Fig. 4 is a side view showing a state in which the left cover of the main body has been removed. Fig. 5 is a perspective view showing the relationship between a restricting part and an operating part. Figs. 6 to 10 are views showing the respective states of the operating mechanism. The directions of each component of the chainsaw are defined based on the "up and down," "left and right," and "front and back" shown in the drawings.

[0010] The chainsaw 1 shown in Figure 1 is a small chainsaw known as a top handle saw. This chainsaw (working machine) 1 includes a working unit 20 configured to cut an object to be worked on, and a main body 10 connected to the working unit 20. The main body 10 has a main body case 11, which mounts a motor (prime mover) 30 and a detachable battery 90. The working unit 20 is driven by power supplied from the battery 90 to the motor 30. Note that instead of the motor 30, a small and lightweight internal combustion engine can also be mounted as the prime mover, in which case a fuel tank is mounted instead of the battery 90.

[0011] In the illustrated configuration, the working unit 20 is a chain cutter. The chain cutter includes a guide bar 21 and a saw chain 22. The guide bar 21 is a plate-shaped member extending in the front-rear direction, and the rear end of the guide bar 21 is attached to the front right side of the main body 10 as shown in FIG. A circular saw chain 22 is wound around the outer periphery of the guide bar 21. The rear end of the saw chain 22 is engaged with a drive gear connected to an output shaft 31 of a motor 30. When the motor 30 is driven to rotate a drive gear (not shown), the saw chain 22 rotates along the outer periphery of the guide bar 21.

[0012] The main body case 11 is a box made of resin. A top handle 40 is integrally formed on the top of the main body case 11. A side handle 50 is attached to the left side of the main body case 11. An operator can perform work by holding the top handle 40 and the side handle 50 with each hand. 1, a motor 30 is housed in the front portion of the main body case 11. The motor 30 is a known electric motor. An output shaft 31 of the motor 30 extends in the left-right direction (from the front to the back of the page). In addition to the motor 30, the front part of the main body case 11 also houses a control board (not shown) that controls the drive of the motor 30, and a drive mechanism such as a drive gear (not shown) connected to the output shaft 31 of the motor 30.

[0013] Meanwhile, a battery attachment / detachment section 12 to which the battery 90 can be attached and detached is provided at the rear of the main body case 11. The battery attachment / detachment section 12 is formed on the rear end surface of the main body 10. The battery attachment / detachment section 12 has a holding section 13 that holds the battery 90 and a battery case 14 that houses the lower part of the battery 90. The holding portion 13 is formed at the rear end of the main body case 11 and at a plate-like portion extending upward from the rear end of the main body case 11. As shown in Fig. 3, the holding portion 13 is inclined so that the lower portion is positioned further forward than the upper portion. The holding portion 13 is also provided with an attachment / detachment mechanism 15 for attaching and detaching the battery 90. The attachment / detachment mechanism 15 has a guide member into which the battery 90 is fitted in the vertical direction, and a support member (not shown) that supports the battery 90 from below.

[0014] When attaching the battery 90 to the holder 13, the battery 90 can be attached to the holder 13 by sliding the battery 90 downward relative to the attachment / detachment mechanism 15, as shown in FIG. The battery 90 is a known battery, and as shown in FIG. 3, is configured by housing a secondary battery such as a lithium ion secondary battery in a rectangular parallelepiped case that extends in the vertical direction. 1, the height of the battery 90 is greater than the height of the rear end of the main body case 11. The battery 90 is larger in size than the type of battery that is housed in the main body case 11. The battery 90 has a sufficiently high output and charging capacity suitable for the work.

[0015] When the battery 90 is attached to the holder 13, the longitudinal direction of the battery 90 is aligned with the height direction of the main body case 11. In addition, the upper end of the battery 90 attached to the holder 13 protrudes above the rear end of the top handle 40. The holding section 13 is also provided with an ejection mechanism (not shown) for removing the battery 90 from the battery attachment / detachment section 12. With the battery 90 attached to the holding section 13, the battery 90 can be pushed up by operating a lever provided on the top of the battery 90 to activate the ejection mechanism.

[0016] 3, a metal connection terminal 16 is provided on the rear end surface of the holding portion 13. The connection terminal 16 is electrically connected to the control board and the motor 30 (see FIG. 1). When the connection terminal 16 of the holding portion 13 is connected to the connection terminal of a battery 90, power is supplied from the battery 90 to the control board and the motor 30. 1, the battery case 14 is formed at the lower end of the battery attachment / detachment portion 12. The battery case 14 is a cylindrical portion that houses the lower portion of the battery 90. The lower portion of the battery 90 is inserted into the battery case 14.

[0017] As shown in FIG. 1, the top handle 40 is formed continuously with the top surface of the main body case 11 and extends in the front-rear direction above the main body case 11. The front end 41 of the top handle 40 protrudes upward from the front end of the top surface of the main body case 11. As shown in FIG. 4, a drive switch 60 is provided on the inside of the front end 41 of the top handle 40. This drive switch 60 controls the operation of the working unit 20. Specifically, the drive switch 60 controls the rotation speed of the motor 30 according to the amount of depression of the head, thereby increasing or decreasing the rotation speed of the saw chain 22. Meanwhile, the rear end 42 of the top handle 40 is connected to the upper end of the holding portion 13 of the battery attachment / detachment portion 12. When the battery 90 is attached to the holding portion 13, the upper end of the battery 90 protrudes above the rear end of the top handle 40.

[0018] A grip portion 43 extending in the front-to-rear direction is provided between the front end portion 41 and the rear end portion 42 of the top handle 40. The grip portion 43 is inclined slightly downward from the front end portion 41 to the rear end portion 42 of the top handle 40. The grip portion 43 is a portion that an operator holds when holding the chainsaw 1. The operator's hand is inserted into the space between the grip portion 43 and the top surface of the main body case 11.

[0019] A trigger lever 71 is disposed on the underside of the front end of the grip part 43 as an operating means for increasing or decreasing the rotation speed of the saw chain 22. In other words, the trigger lever 71 is configured to control the operation of the working part 20 via the drive switch 60. The operator can operate the trigger lever 71 while holding the grip part 43. Meanwhile, a lockout lever 72 is provided on the upper surface of the grip portion 43 so as to be displaceable relative to the trigger lever 71. Specifically, the lockout lever 72 is disposed so as to be able to freely protrude and retract from the grip portion 43 (main body case 11). When an operator grips the grip portion 43, the lockout lever 72 is pushed by the palm of the operator and retracts into the grip portion 43. This allows the lockout lever 72 and the trigger lever 71 to be operatively connected within the grip portion 43 so that the trigger lever 71 can be operated for the first time.

[0020] Further, inside the grip portion 43, a restricting portion 73 is provided to restrict the position of the trigger lever 71 relative to the grip portion 43 (main body case 11). In this embodiment, the operation mechanism 70 is made up of a trigger lever 71, a lockout lever 72, and a restricting part 73, all of which are provided on the grip part 43 (main body case 11). By operating this operation mechanism 70, the operation of the working part 20 can be controlled, i.e., the rotation speed of the saw chain 22 can be increased or decreased.

[0021] 3, the side handle 50 extends in the front-to-rear direction from the front end to the rear end of the left side surface of the main body case 11. The side handle 50 may be made of resin, or may be formed by bending a lightweight metal pipe. The front end of the side handle 50 is attached to the left side surface of the front end 41 of the top handle 40. The rear end of the side handle 50 is located rearward and below the output shaft 31 of the motor 30, and is attached to the left wall of the battery case 14. The portion of the horizontal handle 50 between its front end and rear end is curved so as to bulge outward relative to the left side surface of the main body case 11 (see FIG. 2).

[0022] 2, in the chainsaw 1 of this embodiment, a thumb rest 45, a power switch 46, and an indicator light 47 are provided on the upper surface of the front end portion 41 of the top handle 40. That is, the power switch 46 is provided on the grip portion 43 (main body case 11). The thumb rest 45, power switch 46, and indicator light 47 are provided in a recessed surface 40a formed on the upper surface of the top handle 40. The recessed surface 40a is slightly recessed from the upper end surface of the grip portion 43 (see FIG. 1). In addition, a protrusion 40b is formed on the recessed surface 40a, which protrudes laterally to the right beyond the right side surface of the grip portion 43. The thumb rest 45 is an area on which the pad of the right thumb rests when the operator holds the grip portion 43 with his or her right hand. The thumb rest 45 is disposed on the axis L in the front-rear direction that passes through the center of the grip portion 43 in the left-right direction.

[0023] The power switch 46 is a push button switch that, when on, drives the motor 30 (see FIG. 1) and, when off, stops driving the motor 30. The power switch 46 is circular in plan view and protrudes slightly beyond the recessed surface 40a (not shown). The power switch 46 switches between on and off each time it is pressed. When the power switch 46 is pressed to turn on the motor 30 while it is stopped, power is supplied from the battery 90 to the control board (not shown), and the motor 30 enters a standby state for driving. Then, when the trigger lever 71 is pulled with the lockout lever 72 pressed in, power is supplied from the battery 90 to the motor 30 via the control board, and the motor 30 starts to drive. When the power switch 46 is pressed to turn it off while the motor 30 is running, the supply of power to the motor 30 is cut off, and the driving of the motor 30 stops.

[0024] The power switch 46 is provided alongside the right side of the thumb rest 45. The power switch 46 is located on the protruding portion 40b of the recessed surface 40a. In this way, the power switch 46 is located at a position protruding from the top handle 40 on the opposite side (right side) of the side handle 50 (left side). The indicator light 47 is preferably configured as an LED (light-emitting diode) lamp provided on the thumb rest 45. The indicator light 47 indicates the on / off state of the power switch 46. That is, the indicator light 47 is lit when the power switch 46 is on and is extinguished when the power switch 46 is off.

[0025] Next, the configuration of the operation mechanism 70 will be described in detail with reference to FIGS. As described above, the operating mechanism 70 includes the trigger lever 71, the lockout lever 72, and the restricting portion 73. The trigger lever 71 has a trigger lever main body 711 rotatably attached to the grip portion 43 (main body case 11), and an operating portion 712 that is displaceable relative to the trigger lever main body 711 and has a protrusion 712a located inside the grip portion 43 (main body case 11). In this embodiment, the operating portion 712 is attached to the trigger lever body 711 so as to be rotatable.

[0026] 6, the trigger lever body 711 has a recess 71a that opens upward. The operating part 712 is housed in this recess 71a, and a part of the lockout lever 72 (a leg part 722 described later) is configured to be inserted into this recess 71a. 5, the trigger lever 71 further has a torsion spring 713 attached to the rotation shaft 712d of the operation part 712. One end 713a of the torsion spring 713 presses the operation part 712, and the other end 713b presses the front inner surface of the recess 71a of the trigger lever body 711. The torsion spring 713 biases the operation part 712 in a direction that protrudes from the trigger lever body 711 (counterclockwise in FIG. 4).

[0027] As shown in FIG. 4, the trigger lever body 711 has a front part 711a, a rear part 711b provided with a recess 71a, and a rotation shaft 711c provided at the connection between these parts. The front part 711a is a part that comes into contact with the head of the drive switch 60 and pushes it downward as the trigger lever body 711 rotates counterclockwise. On the other hand, the rear part 711b is a part that is hooked with the index finger and / or middle finger to rotate the trigger lever body 711 counterclockwise. 4, a torsion spring 74 is attached to the pivot shaft 711c of the trigger lever body 711. One end 741 of the torsion spring 74 is fixed to the lockout lever 72, and the other end 742 is fixed to the front end of the rear part 711b of the trigger lever body 711.

[0028] The torsion spring 74 biases the lockout lever 72 in a direction (upward) away from the trigger lever 71, and biases the trigger lever main body 711 in a direction (clockwise) protruding from the main body case 11. A locking portion 711d protrudes from the rear end of the trigger lever body 711. This locking portion 711d is locked to the main body case 11, thereby preventing the trigger lever body 711 from unnecessarily protruding (detaching) from the main body case 11. The position shown in FIGS. 4 and 6 is the initial position (hereinafter referred to as "initial position") where the trigger lever 71 (trigger lever main body 711) protrudes from the main body case 11 and before an external force is applied.

[0029] The lockout lever 72 has a long lockout lever main body 721, an arc-shaped leg portion (abutment portion) 722 connected to the lockout lever main body 721 so as to extend toward the trigger lever 71, and a rotation shaft 723 provided at the connection between the lockout lever main body 721 and the leg portion 722. In other words, the lockout lever 72 is attached to the main body case 11 with the connection portion between the lockout lever main body 721 and the leg portion (abutment portion) 722 serving as the rotation center 72o. A fixing portion 721a for fixing one end 741 of the torsion spring 74 is provided on the underside of the rear end portion of the lockout lever main body 721. 5 and 6, the restricting portion 73 is provided on the inner surface of the right-side main body case 11. The restricting portion 73 has a lower surface (the surface on the trigger lever 71 side) 731 and a rear end surface 732 that is continuous with the lower surface 731 and extends upward.

[0030] 6 is a state in which the trigger lever body 711 (trigger lever 71) is in the initial position and the lockout lever body 721 (lockout lever 72) protrudes most from the main body case 11. From this state, when an external force is applied upward to the trigger lever body 711 (rear portion 711b) toward the main body case 11 (for example, when the trigger lever body 711 is gripped with the index finger and / or middle finger), the protrusion 712a of the operation portion 712 comes into contact with the restriction portion 73 (lower surface 731), and the trigger lever body 711 comes into contact with the lockout lever 72 (leg portion 722). This prevents the trigger lever body 711 from rotating relative to the main body casing 11. With this configuration, when the trigger lever body 711 is in the initial position, the trigger lever body 711 is prevented from rotating relative to the main body casing 11 at two locations, making it possible to suitably prevent the trigger lever body 711 from being unintentionally operated.

[0031] Furthermore, the main body case 11 has an accommodation space 111 capable of accommodating the protrusion 712a of the operating portion 712 between the restricting portion 73 (rear end surface 732) and the lockout lever 72 (leg portion 722). 7, when an operator grasps the grip portion 43 with his / her hand and rotates the lockout lever 72 with his / her palm so that the lockout lever 72 is retracted into the grip portion 43, the leg portion 722 is positioned above the recessed portion 71a of the trigger lever body 711. However, even if the operator grips the trigger lever body 711 with, for example, the index finger and / or middle finger in this state, the protrusion 712a of the operating portion 712 comes into contact with the restricting portion 73 (lower surface 731), so that the trigger lever body 711 is still prevented from rotating relative to the main body casing 11 (i.e., rotation is locked).

[0032] Thereafter, for example, by rotating the operating portion 712 clockwise with the index finger, the protruding portion 712a is positioned rearward of the lower surface 731 of the restricting portion 73 (below the accommodation space 111) as shown in Fig. 8, and the protruding portion 712a and the lower surface 731 no longer interfere with each other. This allows the trigger lever body 711 to rotate relative to the main body case 11 (i.e., the rotation lock is released). In this state, for example, when the trigger lever body 711 is gripped with the index finger and middle finger, as shown in Figure 9, the leg portion 722 of the lockout lever 72 is inserted into the recess 71a of the trigger lever body 711, and the protrusion portion 712a of the operating portion 712 passes between the regulating portion 73 (rear end surface 732) and the leg portion 722 of the lockout lever 72 and moves toward the storage space 111.

[0033] At this time, the front portion 711a of the trigger lever body 711 also rotates counterclockwise around the rotation shaft 711c, gradually pushing in the head of the drive switch 60. This increases the rotation speed of the saw chain 22. Ultimately, as shown in FIG. 10, the trigger lever 71 and the lockout lever 72 reach their closest position. At this time, the front portion 711a of the trigger lever body 711 pushes in the head of the drive switch 60 the most, and the rotation speed of the saw chain 22 reaches its maximum. Therefore, the rotation speed of the saw chain 22 can be adjusted by changing the degree of gripping force (external force applied) on the trigger lever body 711. With this configuration, it is necessary to release the state (locked state) in which the trigger lever body 711 is prevented from rotating relative to the main body case 11 by the lockout lever 72 and the operating part 712 with two actions, so that unintentional rotation of the saw chain 22 can be more reliably prevented.

[0034] 8, if the operating part 712 is further rotated clockwise relative to the trigger lever body 711, the protrusion 712a comes into contact with the leg 722 of the lockout lever 72, preventing further clockwise rotation. At this time, if the trigger lever body 711 is gripped, the protrusion 712a can be moved along the leg 722 toward the accommodation space 111. In other words, with the lockout lever 72 approaching the trigger lever 71, a part of the lockout lever 72 (the leg 722) can function as a guide that guides the protrusion 712a of the operating part 712 into the accommodation space 111. In this case, the trigger lever body 711 can be rotated more accurately relative to the main case 11. In other words, the saw chain 22 can be rotated more accurately and safely.

[0035] Furthermore, the lower surface (the surface on the trigger lever 71 side) 731 of the restricting portion 73 is configured as an arc-shaped curved concave surface. With this configuration, the protrusion 712a can move smoothly along the lower surface 731 when the operating portion 712 of the trigger lever 71 is rotated clockwise. Furthermore, the top of the protrusion 712a of the operation portion 712 has a semicircular curved convex surface. This configuration allows smoother movement along the lower surface 731 of the protrusion 712a. The corners of the boundary between the lower surface 731 and the rear end surface 732 are rounded (R-shaped). In this case, when the protrusion 712a of the operation unit 712 is moved from the position where it contacts the lower surface 731 to a position rearward of the rear end surface 732, it is possible to make it less likely to get caught on the corners of the restriction unit 73.

[0036] The operating portion 712 further has a finger hook 712b and a circular arc-shaped convex reinforcement portion 712c. The finger hook 712b is a portion that rotates the operating portion 712 relative to the trigger lever body 711. The reinforcement portion 712c is provided between the finger hook 712b and the protrusion 712a. A portion 711f of the trigger lever body 711 that faces the reinforcement portion 712c also has a circular arc-shaped concave portion corresponding to the shape of the reinforcement portion 712c. This configuration improves the mechanical strength of the operating portion 712 and effectively prevents chips and the like from clogging the gap between the operating portion 712 and the trigger lever body 711.

[0037] As shown in Figure 4, when the chainsaw 1 is placed on a flat surface and viewed from the normal direction of the flat surface (for example, from above), the rotation center 71o of the trigger lever main body 711 (center of the rotation shaft 711c) overlaps with the power switch 46. With this configuration, the length of the main body 10 in the front-to-rear direction can be designed to be shorter, which contributes to the miniaturization of the chainsaw 1. It also makes it easier for the operator to turn the power switch 46 on and off with the thumb of the hand holding the grip portion 43. In particular, in this embodiment, the distance D1 between the rotation center 72o of the lockout lever 72 (center of the rotation shaft 723) and the center line 46c of the power switch 46 is set to be shorter than the distance D2 between the rotation center 71o of the trigger lever body 711 (center of the rotation shaft 711c) and the center line 46c of the power switch 46. This configuration contributes to further miniaturization of the main body 10, and ultimately the chainsaw 1.

[0038] In the main body 10 as described above, the main body case 11, trigger lever 71, lockout lever 72, and top handle 40 are preferably made of a relatively hard resin material in order to ensure their mechanical strength. Examples of such relatively hard resin materials include ABS resin, AS resin, polyamide (nylon), acrylic resin, polycarbonate, polyethylene terephthalate, etc. These resins may be used alone or in combination of two or more.

[0039] Furthermore, with the main body 10, the grip portion 43 can be held with one hand, and for example, the power switch 46 can be turned on / off with the thumb. The lockout lever 72 can be pressed in with the palm of the hand, and the trigger lever main body 711 can be pulled up with the ring finger and / or little finger while the operating portion 712 is operated with the index finger. In other words, with such a main body 10, the power switch 46 can be turned on / off and the three members can be rotated (displaced) with one hand, providing excellent operability.

[0040] The displacement of the lockout lever 72 relative to the trigger lever 71 is not limited to rotation but may also be vertical sliding, etc. Furthermore, the displacement of the operating part 712 relative to the trigger lever body 711 is also not limited to rotation but may also be longitudinal sliding, etc. Furthermore, the working unit for cutting the object may be a cutter assembly in which a pair of cutters are slidably stacked, a disk having a pruning blade on its outer periphery, or the like. Furthermore, it may be provided in the following aspects.

[0041] (1) A work machine comprising a working unit configured to cut a work object and a main body connected to the working unit, the main body having a main body case, an operating mechanism and a power switch provided on the main body case, the operating mechanism having a trigger lever configured to control the operation of the working unit, a lockout lever provided displaceably relative to the trigger lever, and a restricting part that restricts the position of the trigger lever relative to the main body case, the trigger lever having a trigger lever main body rotatably attached to the main body case and a restricting part that is provided displaceably relative to the trigger lever main body, and an operating unit having a protrusion located inside the body case, wherein when an external force is applied in a direction toward the body case to the trigger lever body, which protrudes from the body case and is in an initial position before the external force is applied, the protrusion of the operating unit comes into contact with the regulating unit and the trigger lever body comes into contact with the lockout lever, thereby preventing the trigger lever body from rotating relative to the body case, and when the work machine is placed on a flat surface and viewed from the normal direction of the flat surface, the center of rotation of the trigger lever body overlaps with the power switch.

[0042] (2) In the work machine described in (1) above, the main body case has a storage space between the regulating portion and the lockout lever that can store the protrusion of the operating portion.

[0043] (3) A work machine as described in (2) above, wherein when the lockout lever is brought close to the trigger lever, a portion of the lockout lever functions as a guide portion that guides the protrusion portion of the operating portion into the storage space.

[0044] (4) The work machine according to any one of (1) to (3) above, wherein the operating portion is attached to the trigger lever body so as to be rotatable relative to the trigger lever body.

[0045] (5) In the work machine described in (4) above, the operating part further has a finger grip portion for rotating the operating part relative to the trigger lever body, and an arc-shaped reinforcing part provided between the finger grip portion and the protrusion, and the part of the trigger lever body facing the reinforcing part is also arc-shaped corresponding to the shape of the reinforcing part.

[0046] (6) The work machine according to (4) or (5) above, wherein the surface of the regulating portion on the trigger lever side is configured as a curved concave surface.

[0047] (7) The work machine according to any one of (1) to (6) above, wherein the top of the protrusion of the operating part has a curved convex surface.

[0048] (8) The work machine according to any one of (1) to (7) above, wherein the trigger lever body has a recess into which a part of the lockout lever is inserted.

[0049] (9) A work machine according to any one of (1) to (8) above, wherein the lockout lever has a long lockout lever body and an abutment portion connected to the lockout lever body so as to extend toward the trigger lever.

[0050] (10) In the work machine described in (9) above, the lockout lever is attached to the main body case with the connection part between the lockout lever main body and the abutment part as the center of rotation.

[0051] (11) In the work machine described in (10) above, the distance between the rotation center of the lockout lever and the center line of the power switch is set shorter than the distance between the rotation center of the trigger lever body and the center line of the power switch. Of course, this is not the case.

[0052] Finally, while various embodiments of the present invention have been described, these are presented by way of example only and are not intended to limit the scope of the invention. The novel embodiments may be embodied in various other forms, and various omissions, substitutions, and modifications may be made without departing from the spirit of the invention. Such embodiments and modifications are intended to be included within the scope and spirit of the invention, as well as within the scope of the inventions and their equivalents as defined in the accompanying claims. [Explanation of symbols]

[0053] 1: Chainsaw 10: Main body 11: Main unit case 111: Containment space 12: Battery attachment / detachment section 13: Holding part 14: Battery case 15: Detachable mechanism 16: Connection terminal 20: Working section 21: Guide bar 22: Saw chain 30: Motor 31: Output shaft 40: Top handle 40a: recessed surface 40b:Protrusion 41: Front end 42: Rear end 43:Gripping part 45: Thumb rest 46: Power switch 46c: Center line 47: Indicator light 50: Horizontal handle 60: Drive switch 70: Operation mechanism 71: Trigger lever 71a: recess 71o: Center of rotation 711: Trigger lever body 711a:Anterior part 711b: Posterior part 711c: Rotating shaft 711d: Locking part 711f :partial 712 :Operation unit 712a:Protrusion 712b: Finger rest 712c: Reinforcement part 712d: Rotating shaft 713: Torsion spring 713a: One end 713b: Other end 72: Lockout lever 72o: Center of rotation 721: Lockout lever body 721a: Fixed part 722: Leg (contact part) 723: Rotating shaft 73: Regulation Department 731: Bottom surface 732: Rear end surface 74: Torsion spring 741:One end 742: Other end 90: Battery L: Axis line D1: Distance D2 :Distance

Claims

1. A work machine, A cutting tool includes a working unit configured to cut a work object, and a main body connected to the working unit, the main body portion has a main body case, and an operation mechanism and a power switch provided on the main body case, the operating mechanism includes a trigger lever configured to control the operation of the working unit, a lockout lever provided displaceably relative to the trigger lever, and a restricting portion that restricts the position of the trigger lever relative to the main body case, the trigger lever has a trigger lever body rotatably attached to the main body case, and an operating portion provided displaceably with respect to the trigger lever body and including a protrusion located inside the main body case, When an external force is applied to the trigger lever body protruding from the main body case and in an initial position before the external force is applied, the protrusion of the operating section comes into contact with the restricting section, and the trigger lever body comes into contact with the lockout lever, thereby preventing the trigger lever body from rotating relative to the main body case, When the work machine is placed on a flat surface and viewed from a direction normal to the flat surface, the center of rotation of the trigger lever body overlaps with the power switch.

2. The work machine according to claim 1, The main body case has an accommodation space between the restricting portion and the lockout lever that is capable of accommodating the protrusion of the operating portion.

3. The work machine according to claim 2, A work machine, wherein when the lockout lever is brought close to the trigger lever, a portion of the lockout lever functions as a guide portion that guides the protrusion of the operating portion into the storage space.

4. The work machine according to claim 1, The operating portion is attached to the trigger lever body so as to be rotatable relative to the trigger lever body.

5. The work machine according to claim 4, The operating portion further includes a finger grip portion for rotating the operating portion relative to the trigger lever body, and an arc-shaped reinforcing portion provided between the finger grip portion and the protrusion, A work machine, wherein a portion of the trigger lever body facing the reinforcing portion also has an arc shape corresponding to the shape of the reinforcing portion.

6. The work machine according to claim 4, A work machine, wherein the surface of the regulating portion on the trigger lever side is configured as a curved concave surface.

7. The work machine according to claim 1, A work machine, wherein the top of the protrusion of the operating part has a curved convex surface.

8. The work machine according to claim 1, The trigger lever body has a recess into which a portion of the lockout lever is inserted.

9. The work machine according to claim 1, The lockout lever has a long lockout lever body and an abutment portion connected to the lockout lever body so as to extend toward the trigger lever.

10. The work machine according to claim 9, The lockout lever is attached to the main body case with the connection between the lockout lever body and the abutment portion as the center of rotation.

11. The work machine according to claim 10, a distance between the rotation center of the lockout lever and the center line of the power switch is set shorter than a distance between the rotation center of the trigger lever body and the center line of the power switch.

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